You'd be surprised how many people who were hungry enough made it work. Although not a NA, I went through Flight School after 19 years of service. The normal career path and career gates don't apply to those that are chasing something bigger . . .TBH, 6 years puts you in a tough spot. Zero to wings is ~2.5 years for helos/MPRA, more for jets. You'd be maybe just showing up to a fleet squadron when you're getting looked at for LCDR.