User blog comment:Schizophrenic Psycho/Koby's training!!!!!!!!!!/@comment-3181121-20101125201501

If I remember correctly at least Garp stayed on as a marine to help train new marines and because Kong asked him to stay as it would've been embarrassing for the Marines if 2 of their biggest legends quit the corps altogether. So yeah I think Helmeppo and coby continued to train under Garp.