A member of Maritime Safety and Security Team Honolulu prepares to clear a space of potential threats during Tactical Sustainment Training in a shoot house at Schofield Barracks, April 15, 2015. MSST units throughout the Coast Guard conduct regular training and requalify every 90 days to ensure a high level of proficiency in a tactical maritime environment. (U.S. Coast Guard photo by Petty Officer 3rd Class Melissa E. McKenzie)