374MDOS welcomes new commander
YOKOTA AIR BASE, Japan -- Lt. Col Mary O'Loughlin, 374th Medical Operations Squadron outgoing commander, passes the unit guidon to Col. Eveline Yao, commander of the 374th Medical Group, during the 374 MDOS change of command at Yokota Air Base, Japan, July 30, 2012. The passing of the guidon symbolizes the passing of responsibility, a tradition dating back to Roman times. (U.S. Air Force photo by Airman 1st Class Krystal M. Garrett)