Army Gen. Frank J. Grass, chief, National Guard Bureau, receives a flu vaccination at the Pentagon from Army Maj. Laurie Fontaine, a physician’s assistant and medical standards officer with the Army National Guard Office of the Surgeon General, Monday, Sept. 24, 2012. The flu vaccine -- which is mandatory for service members to receive -- is one way service members can remain healthy during the coming flu and cold season. (U.S. Army Photo by Sgt. 1st Class Jon Soucy)