From left, Col. Eric Stone, 633rd Medical Group commander, and Col. Korvin Auch, 633rd Air Base Wing commander, simulate administering CPR during the medical group visit at Langley Air Force Base, Va., June 27, 2011. The base commander toured the facility to establish a rapport and receive a mission briefing from the staff. (U.S. Air Force photo by Airman 1st Class Racheal Watson/Released)