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By Andrea Shalal LITTLETON, Colorado (Reuters) – Lockheed Martin Corp, the Pentagon’s biggest supplier, is ramping up its use of 3D printing and virtual reality simulators to drive down the huge costs of producing national security satellites and safeguard profits in the face of reductions in U.S. defense spending. The company expects to finalize a government contract to buy two new missile-warning satellites in coming weeks for 40 percent less than projected by Pentagon cost estimators due to changes in its manufacturing methods, plant closures and layoffs. We’re leaving no stone unturned,” Mark Valerio, vice president and general manager of military space for Lockheed, told Reuters in an interview at the company’s facility south of Denver. Valerio said Lockheed was pushing hard to continue lowering costs so it could maintain strong operating profits even as lower military spending squeezed revenues.