The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure four diesel engines for repair and modification under a presolicitation notice. The procurement involves the National Stock Number (NSN) 7R-2815-124117665-SX, with delivery terms set to FOB Origin, and all contractual documents will be considered issued upon transmission by various methods including email. These diesel engines and components are critical for military operations, and the government intends to negotiate with a single source under FAR 6.302-1, although all responsible sources may express their interest and capability to fulfill the requirement. Interested parties should contact Andrew N. Phillips at (215) 697-5047 or via email at ANDREW.N.PHILLIPS10.CIV@US.NAVY.MIL, with proposals due within 45 days of the notice publication.