The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support Mechanicsburg, is soliciting proposals for the procurement of a Seam Filler Sealant, identified by NSN 8010 015652623 ST, with a quantity of 2,400 units required. This procurement necessitates engineering source approval to ensure the quality of the part, as it is critical for maintaining operational integrity in military applications, particularly for submarines and surface ships. Interested vendors must possess a valid U.S. security clearance due to the classified nature of the solicitation, and all quotes must be submitted via email to Steve Smithey at STEVE.SMITHEY@NAVY.MIL, with a validity period of six months from the proposal date. For further inquiries, potential offerors can contact Steve Smithey directly at 717-605-7751.