Moment of Silence From left, Defense Secretary Ash Carter, Army Gen. Frank Grass and Air Force Gen. Joseph L. Lengyel observe the invocation during a National Guard Bureau change-of-responsibility ceremony at the Pentagon, Aug. 3, 2016. Lengyel took over as chief of the bureau during the ceremony, succeeding Grass. DoD photo by Navy Petty Officer 1st Class Tim D. Godbee SHARE: Download: Full Size (1.67 MB) Credit: Navy Petty Officer 1st Class Tim D. Godbee VIRIN: 160803-D-SK590-073A.JPG Photo Gallery