Video: Falcon 9 fires engines at pad 39A ahead of Es’hail 2 launch (members only)

Orbital ATK’s proposed rocket to answer the U.S. Air Force’s desire for two families of satellite launchers with U.S.-made propulsion systems will be named OmegA, and the company has selected the cryogenic Aerojet Rocketdyne RL10 engine to power the vehicle’s upper stage, officials announced this week.

The first of up to seven missions planned on United Launch Alliance’s Atlas and Delta rocket fleets this year is scheduled for Saturday from California’s Central Coast, when a Delta 4-Heavy is set for blastoff on a spy satellite delivery flight delayed a month to troubleshoot a hydrogen fuel leak in a booster.

Four unidentified Russian military satellites rode a modified Soyuz booster into orbit Wednesday from a remote space base north of Moscow.