Maj. Dr. Matthew Johnson talks to a Dominican mother about medication doses. U.S. Army Maj. Dr. Matthew Johnson talks to a Dominican mother about medication doses during a medical readiness training exercise in Esperanza, Dominican Republic, on June 4, 2011. Johnson is a physician assigned to the 228th Combat Support Hospital. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 382877-D-BNN93-405.jpg Photo Gallery