I can't give much information for your situation or what you should do to try and remedy the situation,...
It is also unclear if he was actually in a DEP status to get a DEP discharge, but if he was in DEP status (inactive reserve enlisted status) his situation is he screwed himself and it now s'ks to be him.
Color vision also has a contrast element, a person may have sufficient color vision in normal daylight situations, but this same person's color vision may have difficulties or inability to adapt to and function adequately in low light situations.
I told him that if I can’t be a PJ then I wasn’t interested in enlisting. I thought that to get discharged from DEP I had to write a letter to my recruiter’s superior explaining about my color blindness situation.
Indicates both possibility and probability of not understanding the legal Delayed Entry Obligation once enlistment into inactive reserve status happens.
The enlistment process to get a GTEP requires identifying five jobs the potential enlistee has willingness to do. The purpose is to prevent wasting the time and money sending people to process through MEPS that are not legally obligated to enlist.
So what is your DEP discharge Code? Your comments suggest you may have something similar to ZBD. ZBD is refused to enlist—separate action initiated or perhaps ZBC (Apathy or personal problems). Regardless, any I refuse to enlist ultimatum and you can’t make me enlist behavior and conduct trumps any medical disqualification problems in trying to enlist in the Air Force.
Essentially you made your DEP discharge code unfavorable for enlisting in the future as ethically, morally and legally you deserted and abandoned your enlistment promises of having willingness to do any one of the five jobs you listed. Having willingness is a conduct and behavior performance of having dependable, reliable and trustworthy character. A ZBD, ZBC or similar DEP discharge code is the accountability result of poor or undesirable conduct and behavior. Consequently you have both a medical disqualification obstacle and a behavior/conduct obstacle. Nobody has a right or privilege to enlist let alone get a GTEP contract to enlist to get trained to become a PJ. You overstepped into believing you had a right or entitlement, or privilege to demand and acted against your best interests out of poor or inadequate situational awareness. A refuse to enlist requires no written statement by the DEP enlistee giving an explanation why releasing the DEP inactive status reservist from enlistment contract is in the best interests of the Air Force. Expressing I refuse to enlist to a recruiter is the same as saying I quit to an instructor at PJ Indoc. As soon as you utter I refuse to enlist you become a piece of nothing to retuirn to the civilian employment opportunity line to get a job flipping burgers.