Photos: X-37B gallery archive

For the second time this week, United Launch Alliance has delivered an Air Force payload to one of its Cape Canaveral pads for liftoff in July.

SpaceX plans two Falcon Heavy launches this year for the U.S. Space Force in July and October, and United Launch Alliance has four national security space missions on its 2021 schedule, according to a military spokesperson.

United Launch Alliance has released a replay of the May 5 liftoff of NASA’s InSight mission to Mars aboard an Atlas 5 rocket, as viewed by aft- and forward-facing cameras on the two-stage launch vehicle.