One of the oldest fleet of the UNSC, the 61st was built to protect colony. But when the war began the fleet was recomissionned to engage Covenant fleet and find some covenant colony. Constitued of 100 ships, this fleet saw much batlle that any others. Seen that the war turn in a paturn, fleet destroyed after fleet destroyed. In a desesparate move the fleet was equiped with heavy warships like the Supper Carrier Marathon and halcyon cruiser.
Tide have turn
The new generation of ship as appear, give a new chance to the UNSC, The Fleetcom also decide to combined this fleet with theUNSC 14th Nomad Fleet and the UNSC Second Assault Fleet to create the 1st UNSC Armada a Armada constitued of 300 ship of MKII and MKIII warships.