Secretary of Defense Ash Carter is pleasantly surprised by the many familiar faces who turned out to welcome him to his alma mater, Abington Senior High School, in Abington, Pa., March 30, 2015. Carter, who graduated from the school in 1972, used the venue to kickoff a national discussion on building "the force of the future" and what the Department of Defense must do to change and adapt to maintain its superiority well into the 21st century. (DOD Photo by Glenn Fawcett/Released)