The Air Force is required because of the simple physics of flight, and aerial force projection. Add up the following, if you know how to add.
Large masses accelerate more slowly than small masses. It takes more than a mile for a loaded B-52 to get airborn. A B-52 is VERY large. It will not fit on the largest aircraft carrier ever built. A single B-52 carries many times the bomb load of a carrier based bomber. Modern Strategic Bombing is meant to deny Command, Control, Communication and Logistics to the Enemy. A B-52 is a target, and largely unarmed. Fighters, such as the F-22, are required to protect bombers, so the bomber can fulfill it's mission. The Air Force works Way Deep behind the MLR
Now, add THESE facts up. The Primary Mission of Marine Air is to provide Close Air Support for ground troops, and if there is any time or ammo left, can provide air superiority. Notice how few Marine pilots went North on bombing missions during Viet Nam. It was not in the Mission Statement.
78% of the Earth is sea. The Navy projects force at sea, hence the haze gray paint job. Navy air protects carriers and all other shipping until the ship can unload on some Faraway Shore. An aircraft carrier, no matter how large , WILL SINK. Airplanes don't float.
The THREE branches are mutually supporting, even if the Air Force treats it like a 9 to 5 job. Navy Air covers the Sea, and bits close to the Sea, the Marine Air covers the actual combat zone, the Air Force fills in the rest.
No one likes Big Macs, and Walmart, so no one likes the US. Obamaq want to destroy it all, based on some hazy It's A Small World After All crack dream. We are trying to minimize the damage he is doing. You aren't too adept on this Logic thing, are you?
Are you in the U.S. Air Force?