Special Operations Officer

Special Operations Officer, or Spec Ops Officer for short, is a Covenant Sangheili (Elite) rank.

Rank
SpecOps Officer is rather a position/office than a actual rank per se.

Summary
The role of such Elites is to lead a troupe of lower ranked Special Operations forces, much like the role of the higher ranked Special Operations Commander, but the troupe that Spec Ops Officers command holds fewer troops than the one commanded by Special Operations Commanders. In Halo: CE, they were the only kind of Elites that threw Plasma Grenades.

Armor
In Halo 1, it's impossible to see any armor difference from other Special Operations Elites, but in Halo 2, they are the only Elites that have black-colored armor.

Halo: The Flood
In the novel Halo: The Flood, a Special Operations Officer named Zuka 'Zamamee joined other Covenant forces in boarding The Pillar of Autumn, but was shot in the head by the Master Chief, and was extremely wounded. From that moment he wanted to get the permission to kill Master Chief. When he had the permission, he started to lay several traps for S-117, but he survived the traps, and Zamamee finally fought John-117 head-on while on The Pillar of Autumn when he tried to ambush him from an elevator. Zamamee nearly killed John while using a Shade, however, John retreated. Cortana then disabled the elevator, and as it started to drop, the Master Chief tossed two grenades into the elevator. Zamamee was blown out of the Shade, while all his Grunts were killed instantly. Upon impact with the floor of the elevator, several of Zamamee's bones shattered. The last thing that Zamamee saw was his nemesis, before impact with the ground and his subsequent death.