- For other uses, see Ranger.
The Ranger entered service at some point before the year 2270. The Ranger was the prototype of the Ranger-class and designed to resolve situations through combat. Thus, the Ranger and its sister ships were often found on the Klingon and Romulan frontlines. (STO video game: Agents of Yesterday)
In 2270, the Ranger was part of the Federation fleet engaging the Klingon Empire at Caleb IV. The Klingons emerged victorious and drove Starfleet away, but the sacrifice of one Federation starship allowed the Federation fleet to escape the Battle of Caleb IV, including the Ranger. (STO - "Agents of Yesterday" mission: "The Battle of Caleb IV")
During the Temporal Cold War in 2410, the Ranger was upgraded to current technological standards and relaunched as the prototype for the tier 5 Ranger-class temporal battlecruiser. (STO - "Klingon War" mission: "Welcome to Earth Spacedock")
Early in 2411, the Ranger was assigned to the long-lost and newly recovered K class space station Deep Space Station K-13, patrolling the immediate area of the 20 Draconis system. (STO episode: "Reckoning")