U.S. Secretary of Defense <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Chuck+Hagel&family=editorial&specificpeople=504963 ng-click='$event.stopPropagation()'>Chuck Hagel</a> greets U.S. Army troops on the tarmac of Kabul airport before boarding a flight to Washington on March 11, 2013 in Kabul, Afghanistan. Hagel ended his three day visit to Afghanistan on Monday, his first as Secretary of Defense.