I am a girl and I am planning on joining the army when I graduate high school. In 2016-2017 the U.S. Army is planning on opening up Combat to woman. When I join I want to do Infantry and fight on foot in battle etc. What type of Infantry should I specialize in and sign up for? Army or Marines? Please help

US Army is not the Marines. You talk with the recruiter and they will arrange what is available. You need to watch some real life war videos to understand what this is. After 30 years I still have nightmares over the people I have killed.