Battalion

A battalion is a military unit of the UNSC Army and Marine Corps.

Composition
A battalion consists of four companies, plus a group of personnel assigned as "Battalion Headquarters Section", for 800 men in total. Under the UNICOM rank structure, a battalion is commanded by an O-5 Lieutenant Colonel, with an O-4 Major serving as a battalion's Executive Officer (XO). The battalion will also have a "first sergeant", usually a Gunnery Sergeant, First Sergeant or above. Three battalions comprise a Regiment.

Within a regiment, the battalions are named numerically, beginning with First battalion and ending with Third battalion. The battalion's subordinate companies are named phonetically, "A" (Alpha) through "M" (Mike), skipping "J". First battalion's companies comprise A through D, Second battalion's companies E through H and Third Battalion companies I through M.

In the UNSC Army, Battalions allocate Fire Support Teams as part of the battalion's offensive/ defensive plans. Their loadout is usually tailored to their mission, terrain, and expected enemy composition. In defensive operations they provide overwatching support-by-fire, while on the offense they engage enemy vehicles and heavy infantry.

Known Battalions

 * 2nd Shock Troops Battalion
 * 7th Shock Troops Battalion
 * 9th Shock Troops Battalion
 * 10th Shock Troops Battalion
 * 11th Shock Troops Battalion
 * 15th Shock Troops Battalion
 * 15th Combat Engineer Battalion
 * 19th Shock Troops Battalion
 * 21st Space Assault Battalion
 * 22nd Shock Troops Battalion
 * 103rd Shock Troops Battalion
 * 1st Battalion 12th Marines
 * 3rd Battalion 12th Marines
 * 4th Battalion 12th Marines
 * 5th Battalion 12th Marines
 * 3rd Battalion Reserves
 * 3rd Battalion, 8th Armored Brigade
 * 3rd Battalion 67th Marines
 * 13th Battalion
 * 79th Infantry Battalion
 * 554th Battalion, 34th Infantry Brigade
 * 717th Xeno-Materials Exploitation Battalion
 * M-EDF 9/21/1
 * E2-BAG/1/7

List of appearances

 * Halo 2
 * Halo 3: ODST
 * Halo: Reach
 * Halo: The Flood
 * Halo: Ghosts of Onyx
 * Halo: Contact Harvest
 * Halo: Landfall
 * Halo: Last One Standing
 * Halo: New Blood
 * Halo 5: Guardians
 * Limited Edition dossiers
 * Halo Mythos
 * Halo: Official Spartan Field Manual