4th Shock Troops Battalion
Active:	21 July 2172 CE - 9 June 2186 CE
Organization:	Systems Alliance Marine Corps
Affiliation:	Systems Alliance
Branch:	17th Shock Troops Company 18th Shock Troops Company 22nd Shock Troops Company 39th Shock Troops Company 73rd Shock Troops Company 105th Shock Troops Company
Type:	Battalion
Role:	Expeditionary warfare
Size:	900 troops
Part of:	11th Marine Regiment
Headquarters:	Second Fleet
Engagements:	Skyllian Blitz Battle of Elysium First Battle of Torfan Reaper War Fall of Elysium
Commanders:	Lieutenant Colonel Auberto Castricone
Notable:	Marcus L. Shepard Zach Walsh † Nathan Montgomery † Sarann Francis † Joseph Summers † Thomas Berret † Roshia Pelps † Donald Korin † Norman Kyle

The 4th Shock Troops Battalion was a Systems Alliance Marine Corps combat unit attached to the 11th Marine Regiment and commanded by Lieutenant Colonel Auberto Castricone. The unit was trained at the Systems Alliance Marine Corps Barracks on Ferris Fields, the Alliance stationed two companies on Elysium, while the other four were garrisoned with the Alliance Second Fleet. The battalion was severely depleted during the Skyllian Blitz, with its biggest loss suffered during the First Battle of Torfan where three of its six companies were wiped out over the course of the battle. The 4th Shock Troops Battalion wouldn't be returned to full strength until 2179 CE, where it resumed its former duties with the Second Fleet. The unit was deployed to aid with evaucation efforts on Elysium during the Reaper War, where the unit was effectively obliterated at the Fall of Elysium by Reaper forces besieging the planet.