US Air Force (USAF) MASTER Sergeant (MSGT) Terry Butterfield, a Production Superintendent, STAFF Sergeant (SSGT) Laurence Shaw, a Crew CHIEF and SSGT Francisco Casimirlewis, a sheet metal craftsman with the16th Helicopter Maintenance Squadron (HMXS), examine a buckle in the metal frame of an MH-53J Pave Low helicopter in support of Operation ENDURING FREEDOM