Why? Because Raptors are expensive!
X-37B Lands Following 2nd Flight
After 469 days in space the Boeing- built X37B Orbital Test Vehicle (OTV-2) for the U.S. Air Force Rapid Capabilities Office land at Vandenberg Air Force Base, California. The vehicle, built by Boeing Space & Intelligence Systems, just completed a 469-day mission. Designed to launch like a satellite and land like an airplane, the OTV-2 holds the record for the longest mission of a reusable space vehicle.