The Uniform Code of Military Justice regulates discipline in the U.S. Armed Forces. The UCMJ can be found at this link: http://goo.gl/kprgs
Under Article 36, UCMJ, the President publishes Rules applicable to disciplinary actions under Article 15 (non judicial punishment) and at courts-martial. The Manual for Courts-Martial can be found at this link: http://goo.gl/XPi4 [Note: the most recent edition is dated 2008. Do not rely on that as there have been several subsequent Executive Orders amending the rules. Check here (right column) http://court-martial.com/ . The Manual also includes the Military Rules of Evidence which are similar to the Federal Rules of Evidence.