This is a market research request from the Defense Logistics Agency-Aberdeen on behalf of the Army ILSC to support long-term sustainment of the APX-123A transponder system. The government believes BAE Systems is the original equipment manufacturer and sole source for the specified NIINs, but invites any interested party with the capability to manufacture these parts to respond. Responses should include documentation such as questionnaires, drawings, test results, contract history, and data rights, along with company name, CAGE code, and technical point of contact. The NIINs cover power supply, modification kit, single board computer, signal processor, crypto card, and RF module. This request is for information and planning only, does not constitute a solicitation, and the government will not pay for any response costs.