SpaceX’s next Falcon 9 rocket launch, using a previously-flown first stage booster, took a step closer to liftoff Thursday with a countdown rehearsal culminating in ignition of the launcher’s nine Merlin main engines in a hold-down firing at pad 39A at NASA’s Kennedy Space Center in Florida.

This is video footage documenting preparations for the commercial Orbital ATK Cygnus cargo freighter to perform the OA-7 mission to the International Space Station. Activities occurred at the Kennedy Space Center’s Space Station Processing Facility and the Payload Hazardous Servicing Facility. The craft will be boosted into orbit by a United Launch Alliance Atlas 5 rocket on April 18 at 11:11 a.m. EDT (1511 GMT).

Cape Canaveral was the departure point for more space launches in 2015 than in any year since 2003, with 17 takeoffs by Atlas, Falcon and Delta rockets hoisting U.S. military satellites, commercial payloads and cargo for the International Space Station.