I applied in-person. The process took 3 weeks. I interviewed at US Army
Interview
A board review, then MEPS for an increasingly hard physical to pass, background checks, and basic training...then off to OCS for basic Officer selection and schooling, then after graduation you are sent to train on your selected job or Branch. After you pass your individual training you are off to your first duty location.
Received ROTC Scholarship, do well so that you can go to college for free. You will not learn much until you commission as an officer and get on the job training.