A Coast Guardsman with Port Security Unit 305 stands the watch in a battle position at Naval Station Guantanamo Bay, Cuba, July 19, 2017. PSUs are anti-terrorism force protection expeditionary units with boat crews and shore side security teams capable of supporting port and waterway security within the United States or anywhere in the world the military operates. U.S. Coast Guard photo by Petty Officer 2nd Class Matthew S. Masaschi