Fireteam Zulu

Fire Team Zulu is the Squad of UNSC marines that is met about a third the way through Assault on the Control Room. The pelican that is transporting them crashes after dropping them off under the bridge the Master Chief first hears from them on. Weapons that are brought in by Team Zulu include a Rocket Launcher, Sniper Rifle, and a Warthog. A Scorpion Tank is also present, but doesn't seen likely to have been brought by Team Zulu as a pelican can only lift a Tank or a Warthog.

Speculation
Fire Team Zulu and Fire Team Charlie may be in the same company, maybe even same platoon.