Crew members of the U.S. Coast Guard Cutter Thetis clean the 76mm Oto Melara gun after firing 54 rounds at the ex-USS Connolly during the sinking exercise portion of UNITAS Gold. This year marks the 50th iteration of UNITAS, a multi-national exercise that provides opportunities for participating nations to increase their collective ability counter illicit maritime activities that threaten regional stability. Participating countries are Brazil, Canada, Chile, Colombia, Ecuador, Germany, Mexico, Peru, U.S. and Uruguay.