How would i join the 75th ranger regiment after i get out of highschool?

ok im 15 as of right now i will be 19 by the time i graduate and i figure id find out now.Do i get to select the regiment i want when im being recruted? will they stick me in just some random regiment? im asking this because i want to join rangers airborn and i know the 75th has what im intrested in.I know i will have to p ranger school and then training but can i choose to go into the 75th?