Credit Bounty

In Halo Reach, credits are awarded for obtaining medals, getting kills, or doing other acts. The total of all awarded bounty credits is shown as Commendations in the post-game cR breakdown.

Matchmaking Credit Amounts
The following are known credit amounts in multiplayer matchmaking.
 * 4 cR are rewarded for a kill without any medals (killing a single enemy with a shotgun or a grenade ect.)
 * 6 cR are rewarded for an assist.
 * +7 cR are added for killing an enemy with a Head Shot.
 * +8 cR for a Pummel medals.
 * +1 cR are rewarded for beat downs (assasinations without the animation.)
 * +2 cR for assassinations.
 * +7 cR are added for a KftG, Revenge, EMP, First Strike, and Reload This! ect.
 * +10 cR are rewarded for consecutive kill medals (ie. Overkill)

Formula
The formula for calcuating the total cR earned is:

Base Kill points + Style Medals + Miscellaneous Medals + Consecutive Medals + Spree Medals = Total cR

An example would be:

"A player manages to get a Overkill, by first getting an Triplekill with a rocket launcher then finishing another enemy with a headshot."

The cR gained from this situation would grant:

[4cR (4) = 16cR]  +   7cR   +   0cR   +   40cR   +   0cR   =   63cR total

Another example would be:

"In a game of SWAT another player kills an enemy with a headshot."

That player would be awarded 11cR [4cR (base) + 7cR (headshot)].