So if all branches in the military went to war with each other which branch would win?

Department of the Navy for sure, the only one that is actually well rounded and would have utter and complete control of the seas (aka supplies), and therefore the air above them. AEGIS would dominate

The Navy would be ineffectual if you marshalled your forces far enough inland. The big question would be is if the Air Force had adequate protection (say an ocean) to keep the Army away. If not, the Army would win.

Definitely the Navy, more than the others they're a military in their own right.

The Navy has a lot of people, the Marines, Nuc's, air crafts, ships, and many other neat toys.

probably the Navy, they have it all, land sea and air, plus the Marine Corps is part of the Department of the NAVY, soo . . .

I would say the army unless u count the marines under the navy cause then the navy would hav a bunch of people.

well if you count the marines with the navy then the navy would definitly win

the airforce has a lot of bombs though

i think that the navy would win just me

I would say the Navy because they are probably the most well rounded. They have spectacular ground forces (SEALs), great air support, and the largest nuclear arsenal of the 4 major branches.

I feel like this exact question was asked a couple months ago. fortunately this is only a fantasy and would never actually happen :)