This is a sources-sought notice for market research regarding technical and logistical support services for the PATRIOT Missile System and its Major End Items. The required services include technical assistance, system maintenance, training support, and the digitization of technical manuals. The performance period is proposed for five base years plus one five-year option, from March 31, 2026, to March 30, 2036. The primary business unit location for performance is in Tewksbury, Massachusetts. Responses to this RFI are due by 4:00 p.m. on February 12, 2026.