Video: X-37B payload mated to Atlas 5

A rocket engine that could power United Launch Alliance’s next-generation rocket has passed a major design review, clearing the way for full-scale hotfire testing starting next year and certification for test flights in 2019, according to Aerojet Rocketdyne, the powerplant’s developer.

The head of the launch enterprise directorate at the U.S. Air Force’s Space and Missile Systems Center, Claire Leon, spoke with reporters March 15 about the military’s award of a GPS launch contract to SpaceX, and she discussed plans for more head-to-head launch contract competitions in the coming months.

Signaling strength in the international cooperation between the U.S. military and allied nations, a satellite funded by five countries will be launched by the Air Force on Saturday to codify a global communications deal.