This is a sole-source procurement for engineering services supporting the Airborne Systems Training and Research Support (ASTARS) system in the ASTARS III aircraft and ASTARS III simulation lab, announced by NAWCAD at Patuxent River, MD with intended award to Severn Test Services. Although advertised as sole source and not a request for competitive proposals, the government says it will consider other bids and will award on a lowest-priced, technically acceptable basis under a firm-fixed-price contract. The anticipated period of performance runs from order release through 30 September 2027. Offerors must provide sufficient technical literature/documentation, pricing backup, completed fill-in provisions 52.204-24 and 52.204-26, and FAR 52.212-3 representations and certifications. Invoicing and payment will be through WAWF with NET 30 terms, and the contractor must comply with the TikTok/ByteDance covered-application prohibition.