Airman 1st Class Michael Drozdowski (left) and A1C Jonathan Gary, 436th Communications Squadron, work together to install bolts on an instrument landing system (ILS) antenna at the approach end of runway 01 May 23, 2013, at Dover Air Force Base, Del. The ILS is a critical navigation instrument used to aid aircraft flying during instrument conditions to allow safe and accurate approaches to the runway. (U.S. Air Force photo/Greg L. Davis)