I think you have to learn how to fly it and position and balance yourself. So those Marines would be specially trained. But it is a very interesting concept.
But take 4 of these devices and install on each corner of a platform, and you have a flying drone that possibly anyone can fly with carrying a lot of weight.
You could also leap from the tops of buildings.
Or law enforcement personnel can hover above crowds.
I think you have to be in SEAL shape to fly the thing.
Why isn't it powering ultralights ?