No, not to join AFROTC. You will sign a contract at some point during your AFROTC career, which will obligate you to spend four years as an active duty Air Force or Space Force officer. If you are a high school scholarship winner, you will have the first year of AFROTC to try it out and decide if it's something that you want to continue to do. You can leave the AFROTC program (and end your scholarship benefits) any time during the first year of the program.
If you are not a high school scholarship winner, you have the first two years of your AFROTC career to decide if the Air Force/Space Force is a path you'd like to pursue for a career. If, during your first two years in the program, you decide not to continue with AFROTC you can leave with no obligation to the service. However, once you return from Field Training and begin your third year in the program, you will sign a contract that obligates you to spend four years as an active-duty Air Force or Space Force officer.
Be sure to select the "register" link above and sign up for one of our virtual information sessions so we can give you the most current information regarding all things AFROTC.