Originally Posted by
tornadoken
USArmy/USNavy (till 1947) found it entirely suitable to run Air Arms integrated within discrete land and naval Forces. USN continues to integrate Air within its Force
I would agree about the US Navy having its own air arm but pretty clearly the Marines will be more concerned with the land battle and the Navy with the sea battle. Separate arms makes sense for them given the scale of their forces.
In the case of the US Army Air Force the case was far from clear cut as the USAAF was initially engaged only in strategic bombing, very much the preserve of an independent air force.