1st Spartan Regiment

The 1st Spartan Regiment (1-SPR) is one of three field formations of Spartan Branch. 1st Spartans are responsible for unconventional warfare, direct action, anti-insurrection-terrorism-and-piracy-operations (AITPO) missions, among others, in the devastated and turbulent of the United Republic. The regiment is also responsible for most Spartan activity within the territories of the former Covenant member races.
Like its sister regiments, 1st Spartans has a small token command element for local command and to organize its contingent of support and sustainment forces. The regiment's commanding officer is Colonel Iroh Katarn and is headquartered at on .
==Current structure==
*Command Troop
**Reconnaissance, Surveillance, and Target Acquisition Unit
*1 (PROMETHEUS) Commando
**Wolf Troop, 1(P)C
**Hawk Troop, 1(P)C
**Grizzly Troop, 1(P)C
**Lion Troop, 1(P)C
**Eagle Troop, 1(P)C
**Jaguar Fire Support Troop, 1(P)C
*4 (ONYX) Commando
**Gregor Troop, 4(O)C
**Bletchley Troop, 4(O)C
**Stalingrad Troop, 4(O)C
**El Morro Troop, 4(O)C
**67 Troop, 4(O)C
**Antechamber Fire Support Troop, 1(P)C
*19 Commando
*20 Commando
*2 Logistics Group (Forward), 1st Regiment Commando Support
**2 Expeditionary Logistics Battalion (Reinforced)
*Alpha Company, Commando Medical Battalion