Prevent rather than react
How will that do it better than the way the Air Force is currently doing it?
A separate branch of the armed forces comes with all the overhead. A separate personnel system. Separate supply system. Separate planning and intelligence and all the other tasks that the Air Force does. If Trump cancelled military exercises in Korea in order to save money there then how can he be in favor of the billions in extra expenses that comes from having a brand new branch of the services?