No
Depends. If you attend one of the US Military Academies (West Point, Air Force Academy, Naval Academy, or Coast Guard Academy) or you go to school on an ROTC scholarship, you have an obligation to actively serve for five years. If you took ROTC but ROTC had nothing to do with funding your school, there is no obligation to go into the military.
Yes. There are plenty of schools to that will lead to a career in the military. ROTC, West Point NY, Annapolis MD are just some of them.
No you don't unless you are in college ROTC or a military university Lime West Point, Air Force Acadamy, and the Naval Acadamy. You can take ROTC without an obligation to serve in the military upon graduation. The only way you'd be obligated through ROTC is if you attended university on an ROTC scholarship.
To attend West Point, assuming it's the high school West point, then it's simple. All one would need to do is graduate from middle school. If speaking of a West Point College, having a 3.0 and a good score on the ACT or SAT would be beneficial.
The Army, because the Army ROTC was at more colleges than the Navy. Texas A&M's ROTC program commissioned 15,000 officers that served in World War 2, more than any other school, including West Point.
Compete (and excel) in a high school sport.
Extracurricular activities are usually looked on as a positive indicator. Even High School ROTC, from what I hear. Frankly, based on the people I know who were in it, I'd regard it as a slight demerit. It definitely shouldn't be the only thing you did other than go to class. Unless, of course, you really meant it, and the colleges you're talking about are located in West Point, Annapolis or Colorado Springs.
The motto of Manchester High School West is 'West is Best'.
West Jessamine High School's motto is 'The West Way'.
West Seneca West Senior High School was created in 1951.
West High School - Utah -'s motto is 'West High, home of Scholars and Champions!'.
West Carteret High School was created in 1964.