Staff Sgt. Brian Myers Jr., 11th Civil Engineer Squadron airfield lighting NCO in charge, and Airman 1st Class Erick Rodriguez, 11th CES electrical systems apprentice, replace the case of a taxiway location sign after replacing the lights and adjusting the brightness June 1, 2011 at Joint Base Andrews, Md. The Airmen of 11th CES airfield lighting maintain all the lights and their electrical systems on the flightline. (U.S. Air Force photo/Senior Airman Perry Aston)