The USS Constant (NCC-66856) was an Akira Class heavy cruiser starship in service to the Federation Starfleet in the late 24th century. During the Borg Invasion of 2381, the Constant was assigned to defend the planet Khitomer, along with the USS Ranger and USS Arimathea. Although the USS Enterprise-E signaled of an incoming Borg cube, the fleet of three vessels had little chance of defending the Klingon planet. The Constant was destroyed first after the cube adapted to their weaponry; although the vessel was able to launch escape pods, they were all consumed by the ship's destruction. (ST - Destiny novel: Gods of Night)