The opportunity titled '59--BACKSHELL' is a presolicitation notice issued by the Department of Defense, specifically the NAVSUP Weapon Systems Support in Philadelphia. This procurement involves the supply of a specific item identified by NSN 1R-5935-LLF02M009-P8, which is critical for flight operations. The government is seeking proposals from contractors who are already approved sources for this item, as it requires government source approval prior to contract award. Interested businesses should have experience in providing commercial, non-developmental, or off-the-shelf items and must be able to submit the necessary documentation for source approval if they are not already an approved supplier. The deadline for proposals is set for July 3, 2025, and early deliveries are preferred.