Little confused.
Performance enhancers can mean a lot, anything from steroids to over the counter stuff the Military adds to the banned list.
Art 15 normally doesn't include a discharge, and people with Art 15's get Honorable/General Discharges.
Biggest stoppage for you will be maintaining, getting a clearance (unless they don't revoke what you currently have).
That said, the contracting world isn't what it was 7-10 years ago. The market was flooded with guys/gals doing 4 years and bailing for the "Big Bucks" world of contracting. That, combined with a lot of companies entering the market drove salaries down.
Someone with no deployments competing with someone with one or more deployments is at a significant disadvantage.
Your best bet is to get a general under honorable conditions, and see what VA bennies you can get (schooling for one), or see if you have a military skill that translates into a civilian capacity (Commercial/Industrial Diver, ParaMedic for example).
Sorry if this seems vague, but different circumstances give different results; so I can't give you a lot without details.