The Air Force Test Center at Edwards AFB, CA intends to award a firm-fixed-price sole source purchase order to S3 Aerodefense for four Champion Aerospace 28VS50Y-30 aviation power converters. This procurement is restricted to this specific commercial off-the-shelf unit because it is the only known exact drop-in replacement for the inactive military power supply in the F-16 FINS project, meeting strict form, fit, and function requirements. The notice is not a request for competitive quotes, but other responsible firms that believe they manufacture an exact equivalent may submit a capability statement with detailed mechanical drawings, pinout configurations, and testing certifications for consideration. The government retains sole discretion to determine whether to compete the contract based on any responses.