In light of design challenges and a push from the Air Force, Lockheed Martin has stepped away from the optionally manned version of its next-generation, high-altitude intelligence, surveillance and reconnaissance platform in favor of an unmanned system. Earlier this fall, Lockheed's Skunk Works gave a first look at its U-2 replacement proposal, the TR-X. The company had proposed a stealthy high-altitude ISR platform that would leverage the existing U-2 engine and could be fielded as early as 2025. Lockheed had...
