The Naval Air Systems Command is seeking sources to provide installation and material support for CH-53E/K Depot Level Aircraft Modifications, including A-Kit fabrication and installation. Work will be performed at Government-owned CONUS and OCONUS locations, primarily at MCAS Miramar and MCAS New River, with occasional work at sites like MCAS Futenma, Japan. The anticipated period of performance is from FY27 through FY31, and the contract type may include Cost-Plus Fixed Fee, Firm-Fixed Price, and Time & Materials. Prospective offerors must be able to establish modification capabilities within 30 days after contract award. This is a sources sought notice for market research only, not a request for proposals.