"A" Company

"A" Company is an infantry company under the overall command of the 405th Marine Infantry Division in the UNSC Marine Corps. It was present during the Battle of New Mombasa, Battle of Installation 05, and some of the Battle of High Charity. Currently, since their unnamed Company CO is injured, it is being commanded by Sergeant Banks and Gunnery Sergeant Pete Stacker.

Trivia

 * Though it's battalion and regiment haven't been stated, it's speculated that it's in 1st battalion of the 77th Marine Regiment.
 * "A" most likely stands for Alpha, as this is the corresponding name in the UNSC Phonetic Alphabet.