Video: Tower rollback prior to launch of Mars Pathfinder atop a Delta 2

Flying for the 155th and final time, a United Launch Alliance Delta 2 rocket took off from California on Sept. 15 with NASA’s ICESat 2 satellite.

The U.S. Air Force on Thursday demolished towers once used to assemble Delta 2 rockets at Cape Canaveral for missions to Mars, four dozen flights to deploy the GPS navigation network, and numerous launches with scientific, commercial and military payloads.

For the second consecutive day, SpaceX called off a Falcon 9 launch attempt at Cape Canaveral on Thursday evening, this time to complete a software update on the first 60 satellites for the company’s Starlink network to provide high-speed Internet service from orbit.