Video: Falcon 9 launch as seen from KSC press site (members only)

Launch of an Atlas 5 rocket from Cape Canaveral with a U.S. Air Force infrared surveillance satellite was scrubbed Thursday evening after engineers encountered a balky valve associated with the first stage’s liquid oxygen system.

The first pair of RD-181 rocket engines set to launch on Orbital ATK’s redesigned Antares rocket are in the final stages of acceptance testing in Russia ahead of their export to the United States in early July, officials said.

Watch replays from launch pad and tracking cameras of the Orion AA-2 inflight abort test conducted at Cape Canaveral Air Force Station on July 2, 2019.