The Sim

The USS THERMOPYLAE NCC-74703-A is an Presidio Command Battlecruiser Carrier tasked to Special Operations. Sparta Station is one of Starfleet's newest tactical Starbases and supports the Thermopylae mission, Specifically "strategically dangerous unknowns" ... to put it colloquially the THERM is sent by the Federation when "things" go bump in night ... The Thermopylae "bumps" back.
The Therm is a starfighter carrier with a numerically strong Special Operations Marine Strike Group.
The crew is a crew "out of time" literally meaning that a vast majority of the crew has their origins in another point along the Federation timeline with a few
crewmembers being multiple time jump refugees.