Loading... Please wait...2PFDU (Two Piece Flight Duty Uniform) Trousers are MIL-SPEC, flame-resistant ripstop pants authorized for active duty U.S. Air Force in both garrison and deployed locations. The 2PFDU Trouser accompanies the 2PFDU Coat to provide all aircrew members an improved form, fit and function to perform their duties. The zipper fly and button closure ensure ease of use and improved comfort while still offering protection from flash fires like a traditional flight suit would.