Col. Johnny Roscoe, 15th Wing commander (left) passes the 15th Medical Group guidon to incoming commander, Col. Virginia A. Garner, (middle) as former commander, Col. Robie V. Hughes, (right) looks on during the 15th Medical Group change of command ceremony at the Missing Man Formation on Joint Base Pearl Harbor-Hickam, Hawaii, June 24, 2013. The change of command ceremony is a military tradition deeply rooted in history and dates back to the times of the Roman Legion. (Photo by David D. Underwood, Jr.)