This is a sources sought notice for manufacturing and prototyping support for the P-8A Poseidon aircraft at Cecil Field in Jacksonville, Florida. The work involves manufacturing, assembly, and integration of prototype kits, mission equipment racks, and other structural and electrical items, requiring a wide array of advanced fabrication and testing capabilities. The anticipated period of performance includes a 12-month base ordering period and four 12-month option periods. The estimated RFP release is the 3rd quarter of FY26, with an estimated award in the 1st quarter of FY27. The contractor must have a facility enabling rapid response and on-site collaboration at Cecil Field and must employ personnel capable of obtaining secret-level clearances.