Secretary Gates and Adm. Mike Mullen hold a press briefing. Secretary of Defense Robert M. Gates and Chairman of the Joint Chiefs of Staff Adm. Mike Mullen hold a press briefing on "DoD Efficiencies" that mark the next major step in the Defense Department's reform agenda in the Pentagon in Arlington, Va., on Jan. 6, 2011. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 555152-G-RNY49-895.jpg Photo Gallery