Lt. Col. Jonathan Castellanos, 319th Operations Support Squadron commander, speaks to a group of community and business leaders from the greater Grand Forks area, June 24, 2014, in the air traffic control tower on Grand Forks Air Force Base, N.D. The group was attending the Unmanned Aerial Systems Summit held in the city of Grand Forks and visited the base for a brief tour of the proposed site of the Grand Sky business park. (U.S. Air Force photo/Staff Sgt. David Dobrydney)