The Pillar of Autumn (Level)

Were you looking for Pillar of Autumn, the UNSC cruiser?

The Pillar of Autumn is the first level in the campaign mode of Halo: Combat Evolved and in the Halo Trilogy. Master Chief Petty Officer SPARTAN John-117 is revived from his cryo-sleep and makes his way to the bridge of the titular ship to be debriefed by Captain Jacob Keyes about their current situation. After the brief meeting, the Master Chief makes his way off the ship via a Bumblebee escape pod.

Description
This level is set in the and mainly consists of training (below Heroic, or when the player first plays the game). The main objective of the mission is escaping the ship. This level is modified depending on the difficulty chosen. Sergeant Johnson makes different speeches at the beginning of the level, one for each difficulty. In Easy and Normal, the player goes through a testing diagnostic showing the bare basics of controls. In Heroic and Legendary difficulty, this is automatically skipped and the player immediately heads out to find Captain Keyes. On Easy and Normal difficulty, the Motion Tracker and grenades are disabled until certain moments in the level. On Heroic and Legendary, they can be used right from the start.

Part 01: The Pillar of Autumn
{Cutscene}

{Fades into space; Halo is visible above Threshold}

{The camera slowly turns and zooms in onto the Pillar of Autumn''. Longswords soar alongside.}''

Captain Keyes: "Cortana, all I need to know is did we lose them?"

Cortana: "I think we both know the answer to that."

{Inside ship, where the view focuses on Keyes}

Captain Keyes: (sighs) "We made a blind jump. How did they—"

Cortana: "Get here first? The Covenant ships have always been faster. As for tracking us all the way from Reach... at light speed, my maneuvering options were limited."

{Keyes begins pacing around, looking at screens}

Captain Keyes: "We were running dark, yes?"

Cortana: "Until we decelerated. No one could have missed the hole we tore in subspace."

{Keyes looks at a bridge crewman's console.}

Cortana: "They were waiting for us on the far side of the planet."

''{Crewman presses some buttons. The screen shows a diagram of Threshold with Installation 04 in orbit.}''

Captain Keyes: "So, where do we stand?"

Cortana: "Our fighters are mopping up the last of their recon picket now, nothing serious."

''{Keyes examines the main screen, pulls his pipe out of his mouth and shakes some ash off it. He closes his eyes wearily.}''

Cortana: (continues) "But, I've isolated approach signatures from multiple CCS-class battle groups, make it three capital ships per group. And in about 90 seconds they'll be all over us."

Captain Keyes: "Well that's it then. Bring the ship back up to Combat Alert Alpha. I want everyone at their stations."

Cortana: "Everyone, sir?"

Captain Keyes: "Everyone."

{''Alarm klaxon sounds. Crewman on board the bridge run towards their stations.''}

Captain Keyes: "And Cortana..."

{Cortana's avatar appears.}

Cortana: "Hmm?"

Captain Keyes: "...Let's give our old friends a warm welcome."

Cortana: "I've already begun."

{Brothers In Arms by Martin O'Donnell from the Halo: Combat Evolved original soundtrack begins playing.}

{Cuts to the main hold of the Pillar of Autumn'', A Marine waves light batons to guide a Pelican into a correct position. The view moves towards the lower deck.}''

Cortana: (Over Speaker) "Attention: All combat personnel, please report to your action stations."

Cortana: (O.S.) "5th platoon, secure airlocks on Deck 11. 14th platoon, rendezvous with 22nd tactical at bulkhead Charlie 14."

{Marines start talking, readying their weapons, preparing Scorpion Tanks and Warthogs, or just loitering, until the view shows Staff Sergeant Avery Junior Johnson walking through a line of Marines.}

Sergeant Johnson: "You heard the lady! Move like you've got a purpose!"

Cortana: (O.S.) "This is not a drill. I repeat. This is not a drill."

{Following dialogue varies depending on game difficulty.} {Cutscene w/ All Difficulties}

''{Marines get in two lines, facing each other. Johnson walks down the column between the formation.}''

Sergeant Johnson (Easy): "Men... keep your eyes downrange, fingers on your triggers, and we all go home in one piece." {Turns around} "Am I right, Marines?!!"

Sergeant Johnson (Normal): "Once again, it is our job to finish what the flyboys started. We are leaving this ship, platoon, and engaging the Covenant on solid ground. When we meet the enemy, we will rip their skulls from their spines, and toss 'em away, laughin'!" {Turns around} "Am I right, Marines?!!"

Sergeant Johnson (Heroic): "Men, here is where we show those split-chin squid-head sons-of-bitches that they could not have picked a worse enemy than the human race! We are going to blow the hell out of those dumb bugs until we don't have anything left to shoot 'em with! And then we are going to strangle them with their own - living - guts!" {Turns around} "Am I right, Marines?!!"

Sergeant Johnson (Legendary): "Men, we led those dumb bugs out to the middle of nowhere to keep 'em from gettin' their filthy claws on Earth. But, we stumbled onto somethin' they're so hot for, that they're scramblin' over each other to get it. Well, I don't care if it's God's own anti-son-of-a-bitch machine or a giant hula hoop, we're not gonna let 'em have it! What we will let 'em have is a belly full of lead, and a pool of their own blood to drown in!" {Turns around} "Am I right, Marines?!!"

Marines: "Sir, yes sir!"

Sergeant Johnson: "Uh-huh. Damn right I am. Now move it out! Double time!"

{The Marines break formation and run out of the area, as Johnson follows them slowly.}

Cortana: (O.S.) "Attention all personnel: We are reengaging the enemy. Internal and external contact imminent."

Sergeant Johnson: "All you greenhorns who wanted to see Covenant up close... this is gonna be your lucky day."

{Cut to a computer screen}

>(PRIORITY ALPHA)
 * >X - CORTANA 1 0 CRYOSTOR. 23.4.7


 * >UNSEAL THE HUSHED CASKET

Tech Officer Sam Marcus: "Whoa! Sir?"

Tech Chief Thom Shephard: "Right. Let's thaw him out."

{The crewmen begin pressing buttons.}

Tech Officer Marcus: "Okay. Bringing low-level systems online. Cracking the case in thirty seconds." {cut to John-117's cryo tube} "He's hot! Blowing the pins in five."

Part 02: Reveille
Testing only happens in Easy & Normal difficulties

{Gameplay}

Tech Officer Marcus: (O.S.) "His suit shows green. Cycle complete."

{Tube cover lifts itself}

Tech Chief Shephard: {salutes} "Sorry for the quick thaw, Master Chief. Things are a little hectic right now. The disorientation should pass quickly."

Tech Officer Marcus: (O.S.) {waves} "Welcome back, sir! We'll have you battle ready stat."

Tech Chief Shephard: "Chief, please look around the room. I need to get a calibration reading for your battle suit's diagnostics."

{The Chief looks around}

Tech Chief Shephard: "Good. Thank you sir."

Tech Officer Marcus: (O.S.) "I'm bringing your health monitors online, sir."

{The HUD's health bars appear.}

Tech Chief Shephard: (examines panel) "Vital signs look normal. No freezer burn. Okay sir, go ahead and climb out of the cryo tube."

{Cutscene}

{Master Chief gets out of the cryotube}

Tech Chief Shephard: "I gave you a double dose of the wake-up stim. Take a quick walk around the cryo bay and join me at the optical diagnostics station when you're ready."

{Thom walks over, soon Master Chief follows him and stands on a red square.}

{If the Chief does not face Thom or begins to wander:}

Tech Chief Shephard: " Sir, I need you to look at me so we can begin."

{When the Chief faces Thom and stands on the square:)

Tech Chief Shephard: "I know the ordnance techs usually take care of your targeting sensors, but we're short of time, Chief. Just look at each of the flashing panels to target them. When you lock on, it'll change color."

{Chief looks at the flashing lights.}

Tech Chief Shephard: "Okay, that looks good..."

Tech Officer Marcus: "Sir, I'm getting some calibration errors. I'm going to invert your looking pitch, so you can see if you like it better that way." {pitch is inverted} "Try targeting the flashing lights again." {the Chief looks at the panel} "Is that better or should I switch it back?"

{The Chief decides the way he wants.}

Tech Officer Marcus: (O.S.) "OK, I'll leave the pitch normal/inverted. But if you want, you can change it yourself later. (pause) I'm ready for the energy shield test now."

Tech Chief Shephard: "Please follow me to the energy shield test station."

Cortana (COM): (O.S.) "Fire teams, report to defensive positions Alpha through Sierra. Sensors show inbound Covenant boarding craft. Stand by to repel boarders."

{The Chief steps into the square.}

Tech Chief Shephard: "Okay, bring his energy shields online please."

{The Chief's shield meter appears, and charges to full}

Tech Officer Marcus: (O.S.) "Alright. Shields read as fully charged."

Tech Chief Shephard: "Okay, sir. Bring them down to test the automatic recharge."

{Chief's shields get depleted, and recharges itself again}

Tech Officer Marcus: (O.S.) "Recharging normal. Showing green across the board."

Captain Keyes (O.S.): "Bridge to Cryo 2, this is Captain Keyes. Send the Master Chief to the bridge immediately."

Tech Chief Shephard: "Captain, we'll have to skip the weapons diagnostics and I-"

Captain Keyes (O.S.): "On the double, crewman."

Tech Chief Shephard: "Aye aye sir. {Pause} The skipper seems jumpy, we'd better get moving. We'll find your weapons later."

Tech Officer Marcus (O.S.): "Okay. I'll leave the self-diagnostics running, at least."

Tech Chief Shephard: "Good idea. You'd better get to your evac group, Sam!"

Tech Officer Marcus (O.S.): "Affirmative. Just have to reset the computer and I'm outta here!" ''{Banging is heard on one of the observation chamber doors. An alarm activates and flashes red.} "Oh, God! They're trying to get through the door! {The door breaks open and an Elite Major fires on Sam.} Security! Intruders in Cryo 2! No, please don't— {An energy bolt hits Sam, and he falls.} Agh!''"

Tech Chief Shephard: (panicked) "Sam! Sam! (To the Chief) C'mon, we've got to get the hell out of here. This way!"

''{Thom leads Master Chief out and down a corridor. Thom tries to open the second door, which explodes, killing him. The Master Chief leaves the area and sees crewmen battling the Covenant while another crewman is killed by an explosion.}''

Crewman 1: Behind us! They're right behind us!

A few crewmen run into the room while the doors are closing

Crewman 2 or Marine: Secure those blast doors! Move! MOVE!

{A crewman runs away from the blast door, with a second directly behind him.}

Crewman 3: Wait for me!

{The crewman is killed by an explosion just as he reaches the blast doors, which shut slowly.}

Crewman: {If you stay in the room} Master Chief sir, the situation's secure here. You're probably needed somewhere else!

''{Chief finds his way to another room with an Elite. It growls but then Marines fire at it, and the Elite flees. This only happens on Easy and Normal.}''

Marine 1: "Chief, Cortana says get to the bridge, double quick!"

{The Chief makes his way to a room where PFC Chips Dubbo is helping some crewmen battle the Covenant boarders.}

PFC Dubbo: "Sir! The Captain needs you on the bridge, ASAP! You better follow me." {As they come upon more Covenant forces:} "Get clear, Chief!" {As they get to the bridge:} "Captain Keyes is waiting for you, sir!"

{Cutscene}

{Master Chief approaches Keyes.}

Master Chief: "Captain Keyes."

Captain Keyes: "Good to see you, Master Chief. Things aren't going well. Cortana did her best, but we never really had a chance."

Cortana: "A dozen Covenant superior battleships against a single . Given those odds I'm content with three ... make that four kills." (To Master Chief:) "Sleep well?"

Master Chief: "No thanks to your driving, yes."

Cortana: {smiles} "So you did miss me."

''{A loud explosion is heard. The Chief lurches and Keyes grabs a pedestal for support.}''

Captain Keyes: "Report!"

Cortana: "It must have been one of their boarding parties! I'd guess an Anti-Matter Charge!"

Fire Control Officer: "Ma'am! Fire control to the main cannon is offline!"

Cortana: "Captain, the cannon was my last offensive option!"

Captain Keyes: "Alright then. I'm initiating Cole Protocol, Article 2. We're abandoning the Autumn. That means you too, Cortana."

Cortana: "While you do what, go down with the ship?"

Captain Keyes: "In a manner of speaking. The object we found, I'm going to try and land the Autumn on it."

Cortana: "With all due respect, sir, this war has enough dead heroes."

Captain Keyes: "I appreciate your concern, Cortana, but it's not up to me. Protocol is clear. Destruction or capture of a shipboard AI is absolutely unacceptable, that means you're leaving the ship. Lock in a selection of emergency landing zones, upload them to my neural lace, and then sort yourself for a hard transfer."

Cortana: "Aye aye, sir."

{Cortana's avatar disappears.}

Captain Keyes: "Which is where you come in, Chief. Get Cortana off this ship. Keep her safe from the enemy. If they capture her, they'll learn everything. Force deployment, weapons research... Earth."

Master Chief: "I understand."

{Cortana's avatar reappears}.

Cortana: "The Autumn will continue evasive maneuvers until you initiate a landing sequence. Not that you'll listen, but I'd suggest letting my subroutines handle the final approach."

Captain Keyes: "Excellent work, Cortana. Thank you. Are you ready?"

{Cortana looks about the bridge for a moment.}

Cortana: {sighs} "Yank me."

{Captain Keyes pulls a data chip out of the holotank and gives to the Master Chief.}

Captain Keyes: "Good luck, Master Chief."

{The Chief slides the chip into the back of his helmet.}

Cortana: "Hmm... Your architecture isn't much different from the Autumn's..."

Master Chief: "Don't get any funny ideas."

Part 03: AI Constructs and Cyborgs First!
{Gameplay}

{Keyes hands his pistol to the Chief.}

Captain Keyes:"I don't keep it loaded, son. You'll have to find ammo as you go."

{If you linger next to Captain Keyes}

Captain Keyes: "Get moving, Master Chief. There's nothing you can do here."

{or}

Captain Keyes: (Angrily) "I gave you an order, soldier. Get off this ship!"

{If you stay on the bridge but not next to Captain Keyes}

Cortana: "We need to get off this ship, Chief, before we're completely overrun by Covenant."

{If you use the Pistol to kill Captain Keyes or any crewmen.}


 * Cortana: (shocked and infuriated) What the hell are you doing?!


 * Cortana (COM): Security to the bridge, the Master chief has gone rampant! Take him down, boys!


 * {Invincible Marines come in and quickly kill the Master Chief, taunting him afterward.}

{Continuing, without killing anyone on the bridge, Cortana and Master Chief see groups of Marines engaging the Covenant in the mess hall.}

Cortana: "Those Marines could use some help, Chief! Do what you do best!"

{The Chief steps over a body of a dead Marine and picks up an Assault Rifle.}

{If you take a hit with your shields down.}

Cortana: "Keep your head down! There's two of us in here now, remember?"

''{The Chief comes across a group of three Marines fighting an Elite. After he helps them kill the Elite, the ship is rocked by a violent explosion.}''

Marine 4: "What the hell? Did something just hit us?"

Marine 5: "Move it! Back to the airlock!"

''{An explosion comes from the airlock, caused by a Covenant boarding vessel crashing into the Pillar of Autumn, killing two Marines standing guard next to it. Covenant troops pour into the corridor.}''

Captain Keyes (O.S.): "Combat teams on decks five through nine, fall back to secondary defensive positions!"

Cortana: "They're using our lifeboat airlocks to attach their boarding craft...we go out and they come in! Clever bastards..."

{Upon finding a trio of Marines fighting Covenant while taking cover behind Combat Barriers}

Marine 6: "We're taking fire! We could use a hand!"

Captain Keyes (O.S.): "Ops personnel on decks nine through twelve, report to evac stations now!"

{As the Chief comes into a room where the Covenant are on a ledge above him.}

Cortana: "Covenant! On the landing above us!"

{After the battle on the ledges}

Captain Keyes (O.S.): "All hands, this is the Captain. Prepare to abandon ship! Combat teams, repel boarders until Ops personnel are away. Good luck. Keyes out."

{As the Chief sees a lifepod launching with pulse lasers bursting all around the airlocks}

Cortana: "The lifepods are launching! We should hurry."

''{Plasma beams continue to hit the hull. Three lifepods launch from the airlocks in sequence. The third one is hit by enemy fire and explodes.}''

Cortana: "The Covenant are destroying the lifepods... they really don't want us on that ring. {As the Chief passes some blast doors} Warning! Blast doors closing! We have to use the ship's maintenance access ways. Follow the NAV point, it will lead you to an opening."

Captain Keyes (O.S.): "Combat teams Alpha through November, pull out to nearest evac station!"

{As the Chief approaches some doors in the access tunnel}


 * The following only occurs in Easy and Normal difficulties


 * Cortana: "I'm detecting Covenant movement outside the access ways. Activating motion tracker. Let's find a safe exit."


 * {The Chief approaches the first door. Red dots surround his position on the motion tracker.}


 * Cortana: They're right on top of us! We need to find another way through!


 * {The Chief finds another locked door. Red dots still appear on the motion tracker.}


 * Cortana: "We're too close! We need to find another route."


 * {The Chief finds an unlocked door leading into a darkened room.}


 * Cortana: "Motion tracker shows all clear."


 * The Chief encounters a broken door.


 * Cortana: "Wait, we need to get through that door, but it's been damaged by an explosion. Analyzing ... The door's control mechanism is offline, but it's taken a lot of damage. You should be able to bash it open with the butt of your weapon."


 * {The Chief melees the door and it opens.}

Captain Keyes (O.S.): "Combat teams Sierra through Victor, prepare for evac!"

{As the Chief crosses through the control room for his cryo bay and sees Elites looking around in the bay}

Cortana: "It looks like the Covenant wanted to catch you napping."

(If they spot you) {The Elite intruders spot Master Chief, open fire on him (with no effect due to the glass protection), and soon leave the cryo bay.}

{A while later, during another fight.}

Captain Keyes (O.S.): "All combat personnel, fall back to tertiary defensive positions!"

{Later, while the Chief passes through a damaged part of the ship}

Cortana: "The damage to the superstructure is extensive...I don't know how much more abuse the Autumn can take!"

Captain Keyes (O.S.): "Combat teams, fall back to secondary defensive positions!"

{When all of the immediate Covenant forces around the last airlock are defeated}

Cortana: "There's one last lifeboat! Quickly, get aboard before it launches!"

Part 04: Escape
{Cutscene}

Frightened Marine: {trips and falls} "Oh no... oh no!" (Picked up by the Chief and thrown into lifepod) "Ahhh!"

Cortana: "Now would be a very good time to leave!"

''{The Chief sweeps his rifle into the hallway one last time to check for enemies, and enters the lifeboat. He grabs onto a handhold on the ceiling, while the Marine he picked up crawls into a seat}''

Master Chief: "Punch it."

Bumblebee Pilot: (seals her eye visor) "Aye aye, sir!"

{The lifeboat launches out of the airlock.}

Bumblebee Pilot: "We're disengaged. Goin' for minimum safe distance."

Panicking Marine: "We're gonna make it, aren't we, sir? I don't wanna die out here!"

{The Chief pats him on the shoulder.}

Cortana: "Look!"

''{The Chief steps up front. Halo swings into view and the Bumblebee drops towards it}''

Marine: "What is that thing, Lieutenant?"

Bumblebee Pilot: "Hell if I know, but we're landin' on it."

Panicking Marine: "The Autumn! She's been hit!"

{The Chief dashes to the back of the lifeboat, and watches the Autumn.}

Cortana: "I knew it! The Autumn ' s accelerating, Keyes is going in manually!"

{The Autumn is struck multiple times by plasma torpedoes}

Bumblebee Pilot: "Heads up everyone, this is it! We're entering the ring's atmosphere in five!"

Cortana: "Sure you wouldn't rather take a seat?"

Master Chief: "We'll be fine."

{The Chief grips the sides of the lifeboat, and bends his knees.}

Cortana: "If I still had fingers, they'd be crossed..."

{The Bumblebee heads into Installation 04's atmosphere.}

Glitches

 * There is a glitch which allows the player to get back into the cryotube. The player must jump inside the tube and crouch before the cover closes. Once inside, the player will be able to see an apparently decapitated copy of the Master Chief, but once the cover closes, you will be trapped inside and must load the last checkpoint or restart the level.
 * It's possible to stand outside of the energy shield test station while the test is running. Just move carefully into the square and when it starts, the machine will push you out, freezing you in place until the process is done.
 * There is a glitch in the level that allows you to carry three weapons instead of only two. You just have to get off the bridge very fast after Keyes gives you the gun.
 * Sometimes, if you shoot a bridge crewman in the head at the right spot, they will flip once and collapse. This is because they were modeled to die easily if shot. However, experimentation on Halo Custom Edition proved that this was not a state of death, but rather immobility, as you will not respawn if you get shot in the head after bump possessing them, and will still be able to look around as if you were alive. Due to the glitch mentioned above, you can get away with "killing" the entire bridge crew sometimes (except for Captain Keyes) without being trapped on the bridge.
 * On Easy and Normal difficulties, it is possible, though not very easy, to move the first Elite you meet (in the darkened corridor) past the doors that seal behind you. When the level load occurs and the Elite is on the side where the two Marines were, the Elite will freeze and the Marines will ignore it. On Heroic and Legendary, this Elite does not appear.
 * There is a glitch that allows you to walk out of the Pillar Of Autumn. When you come to the window where you can see lifeboats being launched, go to one of the empty airlocks and try to crouch-jump through the door.
 * After you leave the bridge and kill the Grunts, there's Sergeant Johnson in the cafeteria, but he doesn't shoot or move, he will speak when shot and he can go berserk but he just stands there.

Mistakes

 * Sam Marcus and Thom Shephard are wearing orange fatigues in the beginning cut scene, but during the diagnostic, they are wearing yellow fatigues.
 * The officer that shouts to Cortana "Ma'am! Fire Control for the main cannon is offline!" wears blue in the cut scene, however, when you walk up to him, he wears yellow.
 * The pilot in the escape pod also calls the Master Chief "Sir", although she is a lieutenant. Technically, this makes her Master Chief's superior officer, however many other higher ranked Marines also do the same as, more than likely, the current situation where the Master Chief's involvement required him to be in command, meaning he was temporarily in command of them until told otherwise.
 * If you look closely, you can see that when the Master Chief's escape pod launches, it still has its rear hatch open.
 * Captain Keyes tells the combat forces to pull back to their tertiary (3rd) positions before he tells them to pull back to their secondary (2nd) positions.
 * If you examine the burning debris in the beginning of the level that killed Thom, it can be noted that they are actually textured using Forerunner wall textures.
 * In the cinematic when you go to the bridge for the first time, the Pillar of Autumn is hit by an antimatter charge, and the bridge will shake. Captain Keyes and Master Chief will fall on the bridge, but not the crewman behind them.
 * In the scene where the Chief greets Captain Keyes, the main viewscreen has a diagram on it, with an annotation saying 'Trajectory FD: Halo', yet nobody on board the Autumn knows the ring's name. It isn't found out by any of the human characters until Captain Keyes overhears the guards on the Truth and Reconciliation talking about it.
 * The armory that PFC Dubbo leads you through towards the bridge is empty, yet the armory visited later in The Maw is still packed with weapons and ammunition. It is possible that this is because the latter armory, near Engineering, was simply too far away for the Marines to use.

Easter Eggs

 * The bulletin board located near the entrance to the bridge has many fliers that can be read, including the flyer for the missing cat, Jonesy.
 * There is also "The Megg" which looks like an M made from blood and bullets.
 * "Keyes" on Captain Keyes' uniform says "Hello my name" above it. The "is" is missing. This is probably due to the fact that it wouldn't fit.

Miscellaneous

 * If you play the level on Easy or Normal, you have the option to look around from inside the Cryo-tube before stepping out and can even see your characters' lower body, in some ways making it the first time that the player could see their own feet in the entire Halo series. This is also the only time you can see your body when you look down in Halo: Combat Evolved.
 * Sergeant Johnson appears a few times in this level. Firstly, when he is giving his speech to the line of Marines and also appears as the driver of the Warthog in the background at times. He is in the mess hall fighting Covenant. He then sometimes appears guarding a lifeboat airlock, and then is killed in an explosion, and finally appears in the battle with the Covenant on the landing.
 * During the energy shield test, the sound of the machine activating is the same sound as a plasma pistol firing a charged shot.
 * If a player kills an ally from outside the bridge, they will be teleported to the bridge. This is a programmatic measure to prevent the player from escaping the horde of invincible Marines that try to kill them; it stops the player from rushing out of the bridge after killing an ally.
 * If you kill Captain Keyes on the bridge, Cortana will say that the Master Chief has gone "rampant", and a squad of invincible Marines will enter the bridge and kill you. Alternatively, if you kill the crewmen next to him, but not Captain Keyes, Cortana will still sound the alarm of your rampancy. The bridge's exit doors will be locked down preventing you from escaping. You can also kill a crewman, then shoot at a man in a chair. If you shoot them in the head, they will not die, but the reticule will change from blue to red when you target them. Also, if any Covenant are placed on the bridge through a glitch or hack, and they kill any crew member or injure Captain Keyes, Cortana will blame you and call security; however, they will target the actual enemy.
 * Plasma grenades do not appear on Easy and Normal difficulties. However, scripted plasma grenade explosions are still seen.
 * Sometimes you have to kill bridge crewmen to trigger the invincible Marines, and sometimes you only have to injure one.