The 52d Civil Engineering Squadron, Fire & Emergency Services (F&ES) Flight requires the procurement of 2-Piece Flight Duty Uniforms (2PFDUs) in the Operational Camouflage Pattern (OCP). Please see fi... The 52d Civil Engineering Squadron, Fire & Emergency Services (F&ES) Flight requires the procurement of 2-Piece Flight Duty Uniforms (2PFDUs) in the Operational Camouflage Pattern (OCP). Please see find Attachment 1 - List of Materials for a full list. The required uniforms must be constructed of smooth flame-resistant Nomex fabric and non-Ripstop material.