The 149th Fighter Wing seeks a vendor to replace an R-11 engine and provide installation labor, with all services to be performed at the vendor's own shop. The vendor's shop must be located within 15 miles of Lackland AFB, and the vendor must provide towing from JBSA Lackland to their facility. The work is for a specific International 7400 truck with detailed engine specifications. This is a sources sought notice, not a formal solicitation. No budget or specific performance timelines are provided.