This is a sole-source procurement under 10 U.S.C. § 3204(a)(1), meaning full and open competition is not feasible. GE, as the original equipment manufacturer of the F414 engine, is the only known responsible source that can manufacture spares and perform repairs. Only GE possesses the necessary intellectual property, software, engineering and manufacturing processes, contractor-furnished equipment, and tooling. Technical source reviews of each item identified no other sources capable of satisfying the agency’s requirements.