FRCSE requires contractor services to execute Planned Maintenance Interval events for the Navy E-6B Mercury fleet under a DX-A1 national defense priority, with an anticipated C-Type Firm-Fixed-Price contract. The anticipated period of performance is June 2027 through May 2031. This sources-sought market research aims to identify eligible firms of all sizes, assess small business set-aside potential, and gather industry input to improve the RFP. Required capabilities include depot-level PMI, modifications, structural inspection, and strip/paint experience on Boeing 707/C-135/E-6B or similar large transport aircraft, plus certified workforce, Navy maintenance/quality processes, high-stand fuel cell work, SECRET facility clearance, CMMC Level 2 self-assessment, and AS9100/ISO 9001 certification. Offerors must support a facility within 25 miles of NAS Jacksonville meeting specified airfield, hangar, paint, warehouse, office, and LOX/battery infrastructure constraints, including a mandatory 30-calendar-day phase-in.