Koreasat-6A will replace the existing Koreasat-6 satellite and provide television broadcasts across South Korea. It will be stationed in geostationary orbit, meaning the satellite will move at the Earth's rotational speed, allowing it to stay fixed above a specific point on the surface.

Mission: Equipped with four solid rocket boosters, ULA's third Vulcan rocket will take flight on the Space Force's USSF-106 national security mission into geosynchronous orbit more than 22,000 miles above Earth.

SpaceX is preparing to launch one rocket from Kennedy Space Center and then another from Cape Canaveral Space Force Station hours later.