150424-A-BK746-028 CARIBBEAN SEA (April 24, 2015) Hospital Corpsman 2nd Class William Meyer, assigned to Naval Medical Center Portsmouth, Va., explains advanced cardiac life support techniques to Guatemalan medical professionals during a subject matter expert exchange aboard the Military Sealift Command hospital ship USNS Comfort (T-AH 20) during 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)