Coast Guardsmen from Port Security Unit 305 aboard a 32-foot Transportable Port Security Boat patrol a security zone off the coast of Guantanamo Bay, Cuba, Saturday, July, 15, 2017. Coast Guard PSUs serve as anti-terrorism force protection expeditionary units with boat crews and shore-side security teams capable of supporting port and waterway security anywhere the military operates. U.S. Coast Guard photo by Petty Officer 2nd Class Matthew S. Masaschi