The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of window heat control systems, identified by NSN 7R-1680-016586526-P8, with a quantity of 6 units required. This procurement involves a commercial/nondevelopmental item that is flight critical, necessitating Government source approval prior to contract award, as the technical data available does not support full and open competition. Interested vendors must submit the required documentation for source approval along with their proposals, as offers lacking this information will not be considered. For inquiries, Kelly A. Gipson can be contacted at (215) 697-4787 or via email at KELLY.A.GIPSON1@NAVY.MIL, with proposals due within 45 days of the notice publication.