The easiest program to get into is the Army Warrant Officer Program as a helicopter pilot. It is also going to give you the least training. You can become a helicopter or fixed wing pilot in the Marine Corps.
The Navy and Air Force has a lot more fixed wing pilots than rotary wing. It doesn't impress me when I see someone asking how to do something easily. So, I would say the Army for helicopters or the Air Force for fixed wing would be your choices.
To be a Marine Corps pilot you must first become a Marine officer and that is not easy. In the Navy or Marine Corps you'll be required to make landings on carriers at night and that is very difficult.
All branches have planes but none of them are easy. All branches but the army require a bachelors degree. You have to be the best of the best to be pilots cause those slots are limited, and everyone wants to be a pilot.
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