In addition, the USAF continues to fund development work of the Aerojet (formerly Atlantic Research) Variable Flow Ducted Rocket ramjet system as a future propulsion option for an extended range AAM.

此外，美国军继续投资于气研究所（原来的大西研究所）的可变流管动机系统，将其作为增程导弹的未来推进选项。