Ready for blastoff just after sunset Wednesday with a classified payload for the U.S. government’s spy satellite agency, a United Launch Alliance Atlas 5 rocket rolled out to its launch pad at Cape Canaveral late Tuesday afternoon after an unplanned trip back inside its integration building for repairs.

Arianespace announced this week it is organizing a contest open to startups, labs, and universities for a free launch of a nanosatellite on a future rideshare mission, likely on an Ariane 6 or Vega rocket.

The two missions will be launched within roughly three weeks of one another from New Zealand. Liftoff of the Electron rocket with the PREFIRE-1 satellite occurred at 7:41 p.m. NZST (3:41 a.m. EDT, 0741 UTC) on Saturday.