LINE OF LEADERS From left to right, Sgt. Maj. of the Army Kenneth O. Preston, Army Chief of Staff Gen. George W. Casey Jr., Army Secretary John M. McHugh and Secretary of Defense Robert M. Gates arrive at the Army's 235th birthday celebration in the Pentagon's courtyard, June 14, 2010. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 424761-P-GGT72-825.jpg Photo Gallery