Photos: X-37B gallery archive

Boeing conducted a critical test of the launch abort system of the company’s Starliner crew capsule Nov. 4 at White Sands Missile Range in New Mexico.

SpaceX’s Falcon 9 rocket got within a second of liftoff Sunday before a low-thrust alarm triggered an automatic abort. Watch a view of the dramatic last-second countdown cutoff at engine ignition from our camera at the launch pad.

United Launch Alliance and SpaceX recently won contracts worth $739 million to send six missions into orbit for the U.S. military, and the Air Force has announced a new title for its flagship launcher program, dropping “expendable” from the name in a new era of reusable rockets.