No. If you got a four-year scholarship from high school, then the first year of college is paid for, and you can quit at the end of your freshman year with no obligation. If you got a three-year scholarship from high school or college then you are not committed to the Air Force until you accept your scholarship (usually in the fall of your sophomore year). If you did not get any scholarship, then you are not committed to joining the Air Force until you start your junior year of college.
No. Any undergraduate student with three or more years remaining should be eligible. So if you are a second-semester freshman, a sophomore or otherwise and have at least three years remaining in your undergraduate studies, you are likely able to join the ROTC program.
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