The Department of Defense, specifically the Department of the Air Force, is preparing to solicit proposals for the C-5M Contractor Logistics Support (CLS) IV contract, aimed at providing sustainment support for the C-5 fleet over a 5.5-year period. This contract will encompass a range of services including Supply Chain Management of C-5M parts, Line Replaceable Unit Repair, and Engineering Investigative/Technical Support, structured as a Cost-Plus-Fixed-Fee and Firm-Fixed Price Indefinite Delivery Indefinite Quantity contract. The contract is critical for maintaining operational readiness of the C-5 aircraft, with a sole source determination made for Lockheed Martin Aeronautics as the only responsible source. Interested parties are encouraged to monitor the SAM.gov website for the Request for Proposal (RFP) and should direct inquiries to Evan Williams at evan.williams.25@us.af.mil or Erica Martin at erica.martin.2@us.af.mil.