Hire a lawyer familiar with that court jurisdiction. The justice system, just about 100% of the time, bends over backwards for service members. If need be they can likely expedite your son's case. These are patriotic times we are now living in. More positive options are available for service members than civilians, ranging from possible flat out dismissal to reduction of charges to some meaningless charge, or fashioning of a diversion program tailored to your son's specific needs then resulting in dismissal. If you wait, or if he pleads guilty and sentenced to probation, he will likely not be permitted to ship out or be kicked out. Its probably also a good idea for your son to get a drug screen and evaluation now because it would be beneficial to expediting his case. If your son has any defenses that he would want to assert, such as fourth amendment search and seizure issues, expediting his case is less likely. But then again, he likely won't want to assert those defenses formally if he can get a really great result such as I listed above. Your lawyer will be able to evaluate the facts and decide on the best course of conduct.
He will need to disclose the matter to his recruiter. He will also need an attorney to minimize the consequences, and keep his driver's license. His entry to the AF will be delayed until his sentence is over, or until his case is dismissed, or he prevails at trial.
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Full disclosure to the recruiter is essential. Depending on the jurisdiction, probation is likely to be part of the prosecutor's recommendation. The U.S. Air Force, or any other branch of the United States Military will admit a recruit who is on criminal probation. Those charged with Violation of Georgia's Controlled Substances Act, Possessing Marijuana
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It is unlikely he will be allowed to enlist with any kind of drug possession charge in his record. Right now the recruiters are not granting waivers, especially for drug use.
You need to have this completely dismissed to have any chance.