GRADE A TEACHERS Defense Secretary Robert M. Gates thanks a group of top-rated teachers who work for the Defense Department's Dependent School System for their service during their visit to his Pentagon office, Nov. 6, 2008. Each teacher was selected as "Teacher of the Year" in his or her school district. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 771480-F-UEW54-450.jpg Photo Gallery