A Standing Fleet is a Subdivision of Starfleet .
A Standing Fleet is responsible for controlling a specific are of space, it replaces sub divisions of the old Military Operations Command .
Ships in a fixed fleet tend to do more fix route patrols and encouter less weirdness, this is where Starfleet shows its Military side, defending the Federation from aggressors.
As opposed to Roaming Fleets
Borrowed from LUG and then developed.