The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 79 units of a sealing machine, identified by NSN 1R-3540-011867869-SX. 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 source approval information with their proposals, as offers lacking this documentation will not be considered. For further inquiries, potential bidders can contact Connor C. Lewis at (215) 697-4757 or via email at CONNOR.C.LEWIS@NAVY.MIL. The solicitation emphasizes that the award will only be made if the offeror meets all qualification requirements at the time of award.