Salina Prime was a Delta Quadrant world at war with the Druoda, the programmed target of an intelligent long-range warhead that Voyager's crew found stranded on a planet in 2375.
Salina Prime is named in the fifth-season episode Warhead. Harry Kim, commanding the night shift, answers a distress call and beams aboard what seems to be a wounded artificial life form. It proves to be a self-aware weapon of mass destruction that has lost its memory.
When the Doctor helps it recover, the device takes over his programme and demands to be delivered to a military installation on Salina Prime. Kim and Torres discover from its records that the war ended almost three years before and that the launch was a mistake, with a recall order sent too late.
Kim persuades the weapon that its purpose is to protect its people. It rejoins a swarm of sister warheads still heading for the planet and detonates among them.