The USS Nimitz (NCC-74215) was a Federation Defiant-class starship in service during the late 24th century. The Nimitz took heavy damage in late 2374 in a Jem'Hadar attack. Lieutenant Andrea Riffin, the senior surviving officer, assumed temporary command and, with help of Patrick Ingrum from the USS Baldwin, successfully repaired the ship to a point where it could safely hold off a Dominion attack and return to starbase. Andrea's leadership abilities (as well as support from her crew) led Patrick to recommend her for permanent command — a move which Starfleet subsequently approved. (USS Baldwin: "Captain's View")