ARMY SONG Defense Secretary Chuck Hagel, center, and Army senior leaders sing the Army song at a cake-cutting ceremony to mark the Army's 238th birthday at the Pentagon, June 13, 2013. Hagel thanked the Army for its hard work in war efforts and humanitarian missions. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 374034-C-QML55-625.jpg Photo Gallery