S4/BAG/2/5

S4/BAG/2/5 was a UNSC Marine Corps unit. It was stationed on Earth in 2552. That year, they were assigned to Sol Defense Group 3/A-5 when the group requested rearmament.

Speculation
It is possible the S stands for the company, Sierra. The 4 may be fourth platoon of S Co, or fourth battalion that the company is part of. BAG could stand for Brigade Assault Group, which would be the infantry element of a reinforced Marine regiment, or Marine expeditionary brigade. The 2/5 could either be 2nd Battalion, 5th Marines, or 2nd Marines, 5th Division. This is simply conjecture and should not be taken as official.

Halo: Evolutions suggests that the first part of the designation refers to the planet the unit is garrisoned on. It gives the example as "E2/BAG/1/7", where "E2" stands for the colony world of Eridanus II. Based on this piece of information, it would appear that "S4" stands for Sol IV - Mars. Continuing with this, the "2/5" may mean "2nd Battalion, 5th Marines", as what was previously suggested as a possibility above.

Known Members

 * Corporal Benjamín M. Nùñez
 * Lindemuth

List of appearances

 * Halo: Landfall
 * Halo: Arms Race