Space Station Battle Group 4

Space Station Battle Group 4 was a Federation space station, a starbase in Starfleet service in the 2370s decade. BG4 orbited a blue planet in the Trexelian Expanse, in the galaxy's Alpha or Beta Quadrant. ( mission: "Skirmish")

History
Exploration of the Trexelian Expanse was underway by stardate 73XX.6 (circa 2270), led by the USS Valiant (TRX-1701) and its replacement, the USS Trexelprise (TRX-1701). Due to unidentified temporal phenomena, objects and people from throughout the 23rd and 24th centuries, especially the 2260s and 2370s decades, were encountered throughout the expanse. By the time the USS Trexelprise (TRX-1701-D) and USS Voyager (TRX-1701-V) were in service, Starfleet and allied ships from both centuries began engaging in war games to test their mettle against hostile forces. ( missions: "Intro", "Skirmish")

The space station served as base of operations for Battle Group 4, providing docking and repair facilities. Ships returning damaged from encounters could be repaired by workbees. ( missions: "Skirmish", "Events")