[Talisker]

The Air Force and the Defense Advanced Research Projects Agency, or DARPA, are developing a similar vehicle.

Why?

[PapaBear3625]

The Air Force and the Defense Advanced Research Projects Agency, or DARPA, are developing a similar vehicle. Why?

The Army version is launched on top of a booster rocket. I would presume the Air Force version would be launchable from a B-52 or B-2. This would give them the ability to launch what would effectively be a ballistic missile, but without any ballistic missile launch signature.