The president can’t actually make law, as far as I understand it. He, and the various offices managed by the executive branch, apply and enforce the law which Congress has written (give or take some interpretation by the courts).
Sometimes of those laws specifically give the executive broad enough authority over something that it’s very similar to the president being able to write laws about it, but it’s not quite the same and it cant overrule actual laws
Systems like that can easily be difficult or impossible to test on the ground, because they aren’t strong enough to work under gravity. They might need to be in free-fall to survive being deployed