OBSERVING TRAINING U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, observes Afghan police training in Mazar-e-Sharif, Afghanistan, July 17, 2011. Mullen's trip continued with a stop in Kabul, Afghanistan, to visit leaders and attend an International Security Assistance Force change-of-command ceremony, where U.S. Marine Corps Gen. John Allen relieved U.S. Army Gen. David H. Petraeus. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 669898-H-AMQ83-625.jpg Photo Gallery