For ongoing operations in Afghanistan and Iraq, military medical personnel are among the first to arrive and the last to leave. Sustained U.S. involvement in these operations has placed stresses on the Department of Defenses (DOD) medical personnel. As the U.S. military role in Iraq and Afghanistan changes, the Army must adapt the number and mix of medical personnel it deploys. In response to Congress continued interest in the services medical personnel requirements in Iraq and Afghanistan, GAO evaluated the extent to which (1) DOD has assessed its need for medical personnel in theater to support ongoing operations, (2) the Army has adapted the composition and use of medical units to provide advanced medical care, and (3) the Army fills medical personnel gaps that arise in theater. To do so, GAO analyzed DOD policies and procedures on identifying personnel requirements, deploying medical personnel, and filling medical personnel gaps in Iraq and Afghanistan, and interviewed officials.