Cmdr. Michael Sarnowski, Commanding officer of the Coast Guard Cutter Tahoma, smiles as he greets Columbian naval officials in Cartagena, Colombia for the annual UNITAS exercise Aug. 30, 2018. UNITAS is a combined Latin American and U.S. exercise that promotes cooperation, understanding and partnership among the participating navies in order to respond as a unified force to a wide variety of maritime missions.