[herewulf]

Pretty much the only airborne assaults considered still viable are airfield seizures. There is quite a bit of risk from ferrying troops to the drop zone and the time they are in the air (under canopies after exiting the aircraft). So, if the assault force can basically come "out of nowhere" and be on the ground in seconds rather than minutes, then much of the risk is reduced. Logistics can be brought in to the seized airfield in short order once secured.

I could see potential US Army interest in this concept. I think they would want the Starship to land horizontal rather than vertical for rapid disembarking though. I.e.: A ramp drops from the nose cone or similar. That doesn't seem very feasible.