The Boeing H.B. CA developed X-37B is back after going up and touching some Chinese & Russian Satellite's and revolutionizing the space game.
X-37A was our baby back in the 2010 development cycle. All the aerodynamics of the space shuttle were miniaturized and leveraged again. The payloads have certainly changed since the program info went dark.
https://www.spaceforce.mil/News/Article-Display/Article/4112259/x-37b-orbital-test-vehicle-concludes-seventh-successful-mission/