The Naval Supply Systems Command intends to award a sole-source, firm-fixed-price contract for specialized Caterpillar 3126 diesel engines to Puckett Machinery Company. This is not a request for competitive proposals, but challenges to the sole-source decision may be submitted in writing for government consideration. No submission timelines, budget amounts, or performance location are specified in the notice. The government will determine whether to compete the requirement based on any challenges received. Prospective bidders should review the attached sole-source justification for further details on the limited competition decision.