The Department of Defense, through the United States Air Force's 633rd Contracting Squadron, intends to issue a sole-source purchase order for a Hatz Diesel Engine from Hydraulic International Inc. This procurement is necessary due to the obsolescence of the engine, identified by National Stock Number (NSN) 4920-01-614-3132, with no direct replacements available, making Hydraulic International Inc. the only suitable supplier. The engine is critical for supporting the Aerospace Ground Equipment Flight of the 1st Maintenance Squadron. Interested firms capable of providing similar products are invited to submit capability statements by 2:00 PM Eastern Time on December 23, 2025, to Erika Allen at erika.allen.2@us.af.mil, as this notice serves as a combined synopsis/solicitation under FAR Part 13 and FAR Part 12. No solicitation is currently available, and phone inquiries will not be accepted.