NORTH DAKOTA ARRIVAL Defense Secretary Robert M. Gates, left, shakes hands with Air Force Col. Christopher Ayres, commander of the 91st Missile Wing, on Minot Air Force Base, N.D., Dec. 1, 2009. Gates traveled to the base to meet with Air Force leaders there and discuss the safety of America's nuclear arsenal. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 102130-M-WBE33-742.jpg Photo Gallery