Army MP vs Navy MA?

If you're a Navy MA there is a small chance you will eventually go out to sea on a ship although not a lot of MA's do that until they are like E-5 or higher

Other than that, It's more or less the same for each branch. Army is slightly more into the law enforcement side instead of just security and gate guarding.

Overall, the Air Force has the best Military Police program (they are called Security Forces).

Like I said though, it's pretty much the same job regardless of branch.

Army is actual law enforcement. A Navy MA is a glorified security guard.

Me... Retired Chief Petty Officer