150213-N-YO638-138 SAN DIEGO (Feb. 13, 2015) Sailors replace light bulbs on the superstructure of the aircraft carrier USS Ronald Reagan (CVN 76). Ronald Reagan is homeported in San Diego and is undergoing a planned incremental availability maintenance period at Naval Base Coronado. (U.S. Navy photo by Mass Communication Specialist Seaman Cody Hendrix/Released)