Enemies

Jackal Patrol: Jackals supported by Grunts

Jackals: Jackal Defensive Infantry

Skirmisher Infantry: Skirmishers supported by Jackals

Skirmisher Patrol: Skirmishers and the Grunts they barely 
tolerate

Skirmishers: The deadliest of the Jackal Troops

Hunter Kill Team: Hunters supported by an Elite kill team

Hunter Strike Team: Hunters supported by an Elite Strike Team

Hunter Infantry: Hunters supported by Jackals

Hunter Patrol: Hunters, with Grunts underfoot

Hunters: Hunters, the heaviest Covenant shock troops

Brute Kill Team: A Brute Kill Team led by a chieftain

Brute Chieftains: The Brutes who keep other Brutes in line

Brute Tactical: Brutes supported by Skirmishers 

Brute Infantry: Brutes supported by Jackals

Brute Patrol: Brutes accompanied by hopeless Grunts

Brutes: Brutes, even Jackals don't like them.

Elite Strike Team: An Elite strike team lead by a general


Elite Generals: The Elites that command respect from other 
Elites

Elite Spec Ops: The most feared Elite ground troops

Elite Airborne: Elite airborne troops

Elite Tactical: Elite supported by Skirmishers 

Elite Infantry: Elites supported by Jackals

Elites: Elites, with nobody to drag them down

Grunts: More grunts then you could handle. Well...

Heretic Heavy: Elites who won't turn down a good explosion