United States, June 12 -- Sikorsky Aircraft Corp., a Lockheed Martin Co., Stratford, Connecticut, is awarded a not-to-exceed $525,000,000 firm-fixed-price, cost-plus-fixed-fee, cost reimbursable indefinite-delivery/indefinite-quantity contract to provide highly specialized non-recurring engineering, integration, and flight-test support for the development and modernization of the Y/CH-53K Heavy Lift Helicopter program.Efforts include the design, development, testing, verification, and validation of product improvements, as well as the integration and qualification of advanced technologies to enhance aircraft capability, performance, and reliability for the Marine Corps, Navy and a Foreign Military Sales customer.Work will be performed in St...