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，美继续投资于航喷气研究所（原来的大西洋研究所）的可变喷流管火箭发动机系统，将其为增程导弹的来推进选项。