U.S. Air Force Master Sgt. Stephen Greenwood, left, signals pit crew members as they retract an aircraft arresting cable while Airman 1st Class Maria Quinones stands by during a cable arrester system exercise Nov. 14, 2013, at Atlantic City Air National Guard Base, N.J. The system was designed to aid any tailhook-equipped aircraft to stop safely in the event of brake failure. Greenwood and Quinones were fire protection specialists assigned to the 177th Civil Engineer Squadron, New Jersey Air National Guard.