NATIONAL GUARD CHANGE Defense Secretary Leon E. Panetta swears in Army Lt. Gen. Frank J. Grass as National Guard Bureau chief during the change-of-responsibility ceremony for chief at the Pentagon, Sept. 7, 2012. Grass, who received his fourth star during the event, replaced Air Force Gen. Craig R. McKinley. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 670486-T-EIL13-541.jpg Photo Gallery