Orbital ATKs proposed rocket to answer the U.S. Air Forces 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 vehicles upper stage, officials announced this week. The OmegA rocket could launch for the first time in 2021, but Orbital ATK is competing against several aerospace companies for a pot of Air Force funding the military is expected to award this summer.