150731-A-BK746-180 ROSEAU, Dominica (July 31, 2015) Sailors assigned to Navy Environmental Preventive Medicine Unit-2 in Norfolk, Va., tour the Trinidad and Tobago National Petroleum Marketing Company during a subject matter expert exchange in support of Continuing Promise 2015. Continuing Promise is a U.S. Southern Command-sponsored and U.S. Naval Forces Southern Command/U.S. 4th Fleet-conducted deployment to conduct civil-military operations including humanitarian-civil assistance, subject matter expert exchanges, medical, dental, veterinary and engineering support and disaster response to partner nations and to show U.S. support and commitment to Central and South America and the Caribbean. (U.S. Army photo by Spc. Lance Hartung/Released)