The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support MECH, is seeking to procure three units of the Periscope Subassembly, NSN 7H-1240-015583565, for repair and modification. The procurement is limited to a single source due to the government's lack of ownership of the necessary data and rights for alternative sourcing, making it uneconomical to reverse engineer the part. This equipment is critical for optical sighting and ranging applications within military operations. Interested parties may submit their capabilities or proposals within 45 days of this notice, with the primary contact for inquiries being James E. Lewis at (717) 605-7403 or via email at JAMES.E.LEWIS5@NAVY.MIL.