Final answer:
The United States military maintains its own criminal code, the Uniform Code of Military Justice (UCMJ), because the U.S. Code does not address criminal matters within the military. The UCMJ contains provisions for military-specific offenses and discipline, allowing the military to enforce discipline and maintain order within its ranks.
Step-by-step explanation:
The United States military maintains its own criminal code, known as the Uniform Code of Military Justice (UCMJ), because the U.S. Code, which applies to civilian populations, does not address criminal matters within the military.
The UCMJ contains provisions for military-specific offenses and discipline that are not covered by the U.S. Code. It allows the military to enforce discipline and maintain order within its ranks.
Furthermore, the UCMJ ensures that military personnel are subject to a separate legal system that is specifically designed to address the unique circumstances and requirements of military service.