You were tested in the Corps to find out what kind of jobs you were capable of doing.
Then they ASSIGNED YOU TO WHATEVER THEY WANTED.
SEMPER FIDELIS, welcome to the “BIRD ON THE BALL”.
(snicker, snicker)
I already had an MOS, two in fact, three if you count rifleman. I went to USMC (29 Palms and Albany, GA) AND Air Force schools (Denver, CO) for nearly two years to get them.
I had a guaranteed school out of boot camp by contract.
Semper Fi!...................