The Northrop Grumman Global Hawk reached the 100,000-flight-hour mark Sept. 5, 2013, -- a significant achievement for the combat-proven intelligence, surveillance and reconnaissance system. The 69th Reconnaissance Group at Grand Forks Air Force Base, N.D., conducts missions with high-altitude long-endurance unmanned aircraft. (Photo courtesy of Northrop Grumman Corp. U.S. Air Force photo illustration/Staff Sgt. Luis Loza Gutierrez)