I'll make it simple:
If you don't like water stay away from the CG / Navy Marines
If you don't like sand and mud stay away from the Army Marines - Air Force can get its fair share of that stuff too. You're an enlisted grease monkey not a pilot.

If you don't like Bull$hit, stay away from all of the above it takes years to start getting in on the fun. You start out sweeping parking lots/Tarmacs/Motorpools/painting boats.