Staff Sgt. Dylan Zimmerman, 28th Communications Squadron airfield systems NCO in charge, and Senior Airman Taylor Anliker, 28th CS airfield systems technician, verify proper operation of a Digital Audio Legal Recorder at Ellsworth Air Force Base, S.D., April 25, 2013. The DALR records communication between pilots and air traffic controllers which can be used by investigatiors should a crash occur. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)