The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of boresighting equipment, identified by NSN 7R-4920-015852367-ZR, with a quantity of 15 units required. This procurement necessitates engineering source approval due to the flight-critical nature of the item, meaning only approved sources can be considered for the contract, which is essential for maintaining the quality and reliability of the equipment. Interested parties must submit their proposals along with the required source approval documentation within 45 days of this presolicitation notice, and should direct inquiries to Alyssa T. Thieu at (215) 697-0169 or via email at ALYSSA.THIEU@NAVY.MIL for further information.