Founded in 1926, ROTC is a college program that prepares young adults to become officers in the military. In exchange for a partially or fully paid college education and a guaranteed post-college career, ROTC students commit to serve in the military after graduation (generally four years of active duty). It's also possible to do a year or two of ROTC without Service commitment, but simply for the great leadership experience. The Army, Marine Corps, Navy and Air Force each offer their own ROTC program.
https://www.uvu.edu/rotc/