Which branch of the military is the biggest with Security forces?

I want to be Military policemen or just part of any security forces. Which branch has the biggest security forces in it.|||The Army is the largest branch, so they would have the most MP's.|||Army would most likely have the largest, but I would do Air Force if you want to do Military Police. The Air Force treats their people the best out of everyone. Talk to a recruiter or and Air Force guy. Good luck.