Sailors from Construction Dive Detachment Alpha, part of Underwater Construction Team (UCT) 2, homeported in Port Hueneme, Calif., prepare a pile jacket for concrete during an annual maintenance and repair procedure at the Sierra piers on Joint Base Pearl Harbor-Hickam. The Underwater Construction Team provides a capability for construction, inspection, repair and maintenance of ocean facilities in support of Naval and Marine Corps operations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Johans Chavarro/Released)