President Barack Obama and Vice President Joe Biden speak with Defense Secretary Leon E. Panetta and Navy Adm. Mike Mullen, outgoing chairman of the Joint Chiefs of Staff, during the Chairman of the Joint Chiefs of Staff change of responsibility ceremony on Joint Base Myer-Henderson Hall, Va., Sept. 30, 2011. President Barack Obama and Vice President Joe Biden speak with Defense Secretary Leon E. Panetta and Navy Adm. Mike Mullen, outgoing chairman of the Joint Chiefs of Staff, during the Chairman of the Joint Chiefs of Staff change of responsibility ceremony on Joint Base Myer-Henderson Hall, Va., Sept. 30, 2011. SHARE: Download: Full Size (5.19 MB) Tags: Photo Essays Credit: VIRIN: 978266-T-HNN48-525.jpg Photo Gallery