Am I Too Late?
The Short Answer is No.
If you're interested in enrolling in Army ROTC and you are in college, you can start by taking an Army ROTC basic elective course. If you have at least two or more years remaining toward your undergraduate degree but not enough time to complete the Basic Course (Freshman and Sophomore Year), you can enter the Army ROTC Advanced Course (Junior and Senior Year) by completing the Leader's Training Course held at Fort Knox, Kentucky, during the summer.
LTC is four weeks of intense classroom and field training held in the summer at Fort Knox, KY. This course is an accelerated version of the two years of leadership development training Cadets receive in the Basic Course. By transforming yourself through this rigorous training, you will qualify for enrollment in the Army ROTC Advanced Course on campus-provided you have two years of college remaining (undergraduate or graduate). http://www.goarmy.com/rotc/courses-and-colleges/curriculum/leaders-training-course.html