Kokesh received his honorable discharge after one combat tour in Iraq, but he remains part of the Individual Ready Reserve, a pool of former active duty service members in unpaid, non-drill status.
Kokesh's attorney, Michael Lebowitz, has called the investigation an effort to stifle critics of the Bush administration's Iraq policy.
AP Writer Lolita C. Baldor contributed to this report.
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).