The US can easily fill in gaps by taking the Special Operators Combat Controllers (CCTs) who are actually all certified Air Traffic Controllers.
Furthermore, the Air Force could additionally take the Terminal Air Control Party (TACPs) - think of them as a Radio/Strike guy that coordinates Air Strikes, that accompany tactical platoons and cross train them into Air Traffic Control, further augmenting their ability to perform this role.
This doesn’t solve anything because the military still needs those people.
It would be great to help keep CCT skills fresh and current - rotate them around with 'deployments' to civilian facilities. It'd be a win all the way around.