My idea is a micro Phalanx system using a .223 caliber gun instead of the 30mm gun they now use.
If you have a fast computer and a remote control gun you can make an anti rocket system on many platforms like tanks, planes and helicopters.
There is no reason this could not be done. The software is already done; you only need a 100 yard range so a small bullet is OK.
This would make all subsonic missiles obsolete.
The bullets will pose a threat to the ground forces so for close in protection a shotgun style system might be better.
Some one should make a BB gun prototype on a scale model at home so the government doesn’t spend 100 million to determine that it’s too expensive to make.
What happens when the RPG shooter is in close proximity with the light infantry troopers that you just dropped off? You gonna waste a squad of friendlies to save the chopper?
It's roughly the same problem that tanks have when using "active armor" systems that explode when hit with an AT missile. Dismounted infantry probably doesn't want to be anywhere near the tank being attacked.
They already came up with something similar to protect their bases in the Green zone against mortar attack. These radar guided mini phalanx guns don’t shoot birds either because they’re programmed to only look for shells coming in a certain trajectory.