Future soldier for the Military?

Hello, I am a sophomore in high school and I am planning on joining the military. Although, I am not as smart as I may seem. I am pretty strong, and im getting stronger. Is there a branch or something that doesnt require much intelligence? Like, marines or army? I have always wanted to be apart of the U.S. Army RANGERS or apart of any other Special Forces. Does that require a ton of intelligence? I know you have to be mentally tough and physically.