The Department of Defense, through the Department of the Navy's NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two units of the NRP, OBOGS Heat Exchanger, identified by NSN 7R-1680-015991105-E7 and reference number 60847-000. This procurement requires government source approval prior to contract award due to the flight-critical nature of the item, and only previously approved sources will be considered for this solicitation. Interested vendors must submit detailed technical data and documentation as outlined in the NAVSUP WSS Source Approval Information Brochures, as offers lacking the required information will not be considered. For further inquiries, interested parties can contact Christophe J. Ammerman at (215) 697-5047 or via email at CHRISTOPHER.AMMERMAN@NAVY.MIL.