Carrier Strike Group 15

Carrier Strike Group 15, (CSG-15 or CARSTRKGRU 15, and sometimes spelled out, viz. "Fifteen") is a training formation of the United States Navy. It trains and certifies Pacific Fleet Carrier Strike Groups, Amphibious Ready Groups, and independently deploying surface ships. It replaced Commander, Strike Force Training Pacific in a title change. Carrier Strike Group Four is the equivalent command for US Fleet Forces (Atlantic Fleet) ships.

The group was one of fourteen U.S. Navy carrier strike groups established on 1 October 2004. Carrier strike groups are employed in a variety of roles, all of which involve gaining and maintaining sea control.

The group was established as Cruiser-Destroyer Group 1 circa 1973. It was redesignated Carrier Strike Group 15 in 2004 but then soon afterwards disbanded. Carrier Strike Group 15 was briefly based at Naval Station Norfolk, Virginia, in 2004, prior to changing its homeport to Naval Air Station North Island, California, in 2005, with the Nimitz class aircraft carrier USS Ronald Reagan (CVN-76) assigned as its flagship. It was then disbanded, but reestablished as a training formation in 2014.