The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of inertial navigation systems, identified by NSN 7R-6605-017219479-RQ. The 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 comprehensive documentation as outlined in the NAVSUP WSS Source Approval Information Brochures, including technical data and evidence of experience in producing similar items. For further inquiries, interested parties can contact Nadia Govorushko at (215) 697-2813 or via email at NADIA.GOVORUSHKO.CIV@US.NAVY.MIL.