The U.S. Navy Frigate USS Doyle (FFG 39) cruises the Caribbean Sea en route to Colombia, South America, where the ship will meet other naval units participating in the 43rd annual UNITAS exercise. UNITAS is the largest multi-national naval exercise conducted with naval forces from the United States, and countries from South and Central America. The exercises focus on building multinational coalition while promoting hemispheric defense and mutual cooperation. U.S. Navy photo by Photographer's Mate 1st Class Martin E. Maddock.