Video: Delta 4 launches before dawn from California

Two days after launching a Falcon 9 rocket from Florida, SpaceX sent another mission into orbit Sunday from California’s Central Coast with 10 new satellites for Iridium’s voice and data relay network.

The United Launch Alliance Atlas 5 rocket with the NROL-52 spacecraft aboard moved to the launch pad this morning for liftoff Saturday to serve the national interest. Liftoff is scheduled for 3:31 a.m. EDT (0731 GMT).

A hydrogen-fueled main engine and four solid rocket boosters combined to propel a United Launch Alliance Delta 4 rocket off its launch pad at Cape Canaveral on March 15, successfully sending a U.S. Air Force communications satellite into orbit.