Gilgameshan Special Air Service

Formerly H Squadron (Gilgameshan), Special Air Service, the Gilgameshan Special Air Service was the first and smallest of the commando units established by the Gilgamesh Free State, the later two being the Gilgamesh Light Infantry and the Mountain Rifles Brigade. However, unlike the latter two, the GSAS's operations were often of a deniable nature, and while the public knew of their existence, their operations, often carried out in conjunction with the 1st Intelligence Battalion, were shrouded in secrecy. Originally part of the Special Air Service as 'H Squadron (Gilgameshan)', it was first established on the planet in. While the GSAS initially saw massive success against the cells on the planet, as time went on, the GSAS became increasingly made up of native Gilgameshans. This, coupled with exhaustion among the operators, led some to begin to hold rebel sympathies, though hidden and dormant.

In, when the Gilgamesh Free State was established and the UNSC effectively abandoned the planet, H Squadron was disbanded, with most of its operators fleeing the planet or moving to the lawless regions to escape the wrath of the Free State. However, only a few months later, in January of, the Free State, already beginning to deal with violent criminal syndicate and anti-GFS activity, H Squadron was reformed as the Gilgameshan Special Air Service, with the instructor cadre made up of those few operators with rebel sympathies who remained in the Free State.

Over the next several decades, the GSAS carried out many operations similar to what it had in its UNSC days, until it was again disbanded in with the fall of the GFS. Finally, for the third time, it was created again in with the establishment of Gilgamesh as an independent Commonwealth loyal to the, and continued to see action, though mainly against Covenant remnants and pirates, the UEG wary of using it against what few rebel groups remained on Gilgamesh.