Navy Petty Officer 1st Class Matthew Ramirez conducts predive maintenance on a KM-37 diving helmet before an underwater pile removal operation at U.S. Fleet Activities Sasebo, Japan, Jan. 10, 2018. Ramirez is a construction mechanic assigned to Underwater Construction Team 2, and provides construction, inspection, maintenance, and repair of underwater and waterfront facilities in support of the Pacific Fleet. Navy photo by Petty Officer 1st Class Arthurgwain L. Marquez