OTH's (other-than-honorable discharges) are given to Marines who grossly violate the UCMJ (Uniform Code of Military Justice), as in drug use, excessive DUI's, adultery, etc.
It is essential to the maintenance of good order and discipline that the UCMJ be preserved as the preeminent code of conduct for U.S. service personnel.
The Court said that military commissions have historically been conducted within the confines of the rules laid down under the Uniform Code of Military Justice, the UCMJ.