Which military branch is right for me?

SO basically Im 18 and just about to be out of high school and I need some advice, I went to MEPS and got an 86 on the ASVAB without studying and will probably take it again, but I digress. I cant decide weither to join the Navy or the Army (Marine Corps is under consideration as well but more minorly) I have always wanted to be in civil affairs which is my main goal (public affairs or combat logistics specifically) but I also have a vested interst in fighting, I want to do something like the Rangers, or Airr Rescuce (navy) or something like that. All things considered I want to eventually break from the military and go into politics and business ( PLEASE dont skin me for that last comment that doesnt mean I want to be a politician or start a political debate) and I do plan to be in reserves for 4yrs while in college and then go active, which branch can get me there best?