MILITARY SEND-OFF Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, reviews troops during his retirement ceremony and Armed Forces Farewell at Summerall Field on Joint Base Myer-Henderson Hall, Va., Sept. 30, 2011. Army Gen. Martin E. Dempsey will succeed Mullen as the 18th chairman of the Joint Chiefs of Staff. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 057614-K-RHD44-805.jpg Photo Gallery