
The Uniform Code of Military Justice (UCMJ) is a set of laws established by the United States Congress that applies to all active-duty members of the US military, including activated National Guard and Reserve members, military academy students, and some civilians serving in support of the military during wartime. The UCMJ covers various legal infractions, from failure to obey orders to burglary, and includes a General Article that addresses disorders and neglects of discipline in the armed forces. With the UCMJ's broad scope, the question arises as to whether it can preempt international law, especially in cases where military members commit offenses involving the international community. While the UCMJ does not explicitly address this, the preemption doctrine suggests that it cannot supersede international law, as it prohibits the application of the UCMJ to conduct already covered by other laws.
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What You'll Learn

UCMJ and international law: jurisdiction
The Uniform Code of Military Justice (UCMJ) is the foundation of the system of military justice of the armed forces of the United States. It was established by the United States Congress in accordance with their constitutional authority, per Article I Section 8 of the U.S. Constitution, which provides Congress with the power to "make Rules for the Government and Regulation of the land and naval forces" of the United States. The UCMJ is federal law, enacted by Congress, which applies to all active-duty members, activated National Guard and Reserve members, and military academy students. Some civilians serving in support of the military during wartime are also subject to the UCMJ.
The UCMJ is a special set of laws made specifically for members of the military, who are also subject to the laws of the United States and their host countries in times of peace under international treaties. The UCMJ was developed to make the legal system uniform across all services, as previously each service had its own set of legal regulations that changed during peacetime and wartime.
In the case of an offense involving the civilian or international community, the military may opt to let civilian authorities handle the case. However, a military member may be tried for the same crime in both civilian and military courts under separate charges. The UCMJ has various "articles" that enumerate the different legal infractions it covers, such as Article 92 for "Failure to Obey an Order or Regulation" and Article 129 for "Burglary".
In terms of jurisdiction, the UCMJ historically applied to "persons serving with or accompanying an armed force in the field", including military contractors "in time of war". In 2006, Congress expanded the UCMJ's applicability to cover contractors during a "declared war or contingency operation". This change came after the Nisour Square massacre perpetrated by Blackwater Security personnel. As a result, in 2008, a contractor was prosecuted under the new provision, marking the first time since 1968 that a contractor had been charged under military law.
Additionally, soldiers and airmen in the National Guard are subject to the UCMJ if activated (mobilized or recalled to active duty) by an executive order issued by the President or during their annual training periods. On the other hand, members of the State Guard, which is organized under each state's sovereign authority, are not subject to the UCMJ in their capacities as members of the State Guard.
In summary, the UCMJ has broad jurisdiction over active-duty military personnel, activated National Guard members, military academy students, and in certain cases, civilians serving with or accompanying the armed forces. Congress has periodically expanded the UCMJ's applicability, and it serves as the foundation of the U.S. military justice system, operating alongside international laws and treaties.
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UCMJ's applicability to military contractors
The Uniform Code of Military Justice (UCMJ) is a federal law enacted by Congress that applies to all active-duty members, activated National Guard and Reserve members, and military academy students. It is the foundation of the US military justice system, governing the behaviour of those who serve in the armed forces, regardless of rank.
Historically, the UCMJ applied to "persons serving with or accompanying an armed force in the field", and so included military contractors "in time of war". In 2006, the John Warner National Defense Authorization Act expanded the UCMJ's applicability to cover contractors during a "declared war or contingency operation". This change was made following the Nisour Square massacre perpetrated by Blackwater Security personnel. The first contractor was prosecuted under the new provision in 2008, marking the first time since 1968 that a contractor had been charged under military law.
The 2007 Defense Bill, enacted in October, places contractors and others who accompany the military in the field under the UCMJ by defining it to cover civilians not just in times of declared war but also during contingency operations. This means that military officers now have UCMJ authority over contractors.
The UCMJ covers a wide range of offenses, including absence without leave, insubordination, desertion, drug use, fraternization, sexual assault, and murder. Military tribunals, known as courts-martial, are responsible for adjudicating alleged violations of the code.
It is important to note that the UCMJ applies everywhere, whether stationed domestically or deployed overseas, and continues to apply after active duty hours. Misconduct by an officer is subject to the same scrutiny as if it occurred while on duty.
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UCMJ's expansion to cover contractors in 2006
The Uniform Code of Military Justice (UCMJ) was expanded to cover contractors in 2006 through a clause in the 2007 Defense Bill. The bill was enacted in October 2007, placing contractors and other civilians accompanying the military in the field under the jurisdiction of the UCMJ. This change was intended to address the lack of accountability for criminal acts committed by private military contractors in conflict zones.
Previously, contractors were only subject to the UCMJ if Congress had formally declared war, which had not occurred in over 65 years. This meant that in most 21st-century military operations, contractors operated outside the jurisdiction of the UCMJ. While contractors were subject to local laws, in many cases, such as in Iraq, there was no functioning legal system to hold them accountable. This led to concerns about contractor impunity for crimes ranging from theft and fraud to mistreatment of prisoners, operating sex rings, rape, and murder.
The expansion of the UCMJ to cover contractors was seen as a way to address this legal gap and provide a means for military commanders to enforce discipline among civilians accompanying the armed forces. The new law, however, has also raised questions about its interpretation and potential challenges under the Constitution. Some have expressed concern that the broad application of the UCMJ imposes additional behavioural requirements on contract employees, while others worry about how it might be applied in practice.
It is important to note that the expansion of the UCMJ to cover contractors is not a blanket coverage. It specifically applies to civilians accompanying the military in declared wars or contingency operations and those on Department of Defense (DoD) contracts. The law does not cover contractors who are not on DoD contracts or those who are not working in direct support of US military missions in conflict zones.
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UCMJ's application to National Guard members
The Uniform Code of Military Justice (UCMJ) is the foundation of the system of military justice of the armed forces of the United States. It is a federal law enacted by Congress that applies to all active-duty members, activated National Guard and Reserve members, and military academy students. Some civilians serving in support of the military during wartime are also subject to the UCMJ.
The UCMJ was established by the United States Congress in accordance with their constitutional authority, per Article I, Section 8 of the U.S. Constitution, which provides that "The Congress shall have Power... to make Rules for the Government and Regulation of the land and naval forces" of the United States. The UCMJ was enacted in 1951 to create a uniform legal system across all military services.
Soldiers and airmen in the National Guard are subject to the UCMJ only if they are activated (mobilized or recalled to active duty) by an executive order from the President or during their annual training periods, which are orders issued under Title 10. During these periods of duty, they are federalized into the National Guard. Otherwise, members of the National Guard are typically exempt from the UCMJ.
However, under Title 32 orders, or State Active Duty orders issued by state authorities, individual members of the Army National Guard and Air National Guard are subject to their respective state codes of military justice, which often resemble the UCMJ closely. These state codes may also incorporate state civil and criminal laws.
It is important to note that the UCMJ has jurisdiction over offenses committed as part of a service member's "official duties," even if they are not on active duty. Additionally, if a National Guard member is performing duties in a Title 10 status, a unit or commander in Title 32 status does not have jurisdiction over them.
The UCMJ also applies to members of the military Reserve Components, such as the Army Reserve, Marine Forces Reserve, Navy Reserve, and Air Force Reserve, when they are Full-Time Support (FTS) personnel on active duty orders. Furthermore, commissioned members of the NOAA and PHS are subject to the UCMJ when attached to a military unit or during a national emergency or war declaration.
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UCMJ's enforcement and penalties
The Uniform Code of Military Justice (UCMJ) is a federal law enacted by Congress that applies to all active-duty members, activated National Guard and Reserve members, and military academy students. Some civilians serving in support of the military during wartime may also be subject to the UCMJ. The UCMJ defines the military justice system and lists criminal offenses under military law.
The UCMJ has various "articles" that enumerate the different legal infractions it covers. For example, Article 92 is "Failure to Obey an Order or Regulation", while Article 129 addresses "Burglary". Article 134, known as the "General Article", covers all crimes not listed elsewhere and includes offenses such as adultery and other ""disorders and neglects to the prejudice of good order and discipline in the armed forces".
The enforcement of UCMJ articles can vary depending on the specific circumstances and the discretion of the court-martial. For instance, in the case of adultery, the consequences can range from non-judicial punishment to court-martial, depending on the severity and impact on military operations. Non-judicial punishment, which may be applied for less serious offenses, can include reprimand, loss of privileges, reduction in rank, or restriction to specific limits. More severe offenses, such as those involving fraternization, favoritism, or other abuses of position, can result in dishonorable discharge, confinement, or other penalties.
The Manual for Courts-Martial (MCM) is created and maintained by the President and contains the penalties for breaking the laws prescribed by Congress. The MCM is updated periodically to incorporate changes made by the President through executive orders and National Defense Authorization Acts. The current version of the UCMJ, including any amendments, can be found in the latest edition of the MCM (2019).
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Frequently asked questions
The Uniform Code of Military Justice (UCMJ) is the foundation of the system of military justice of the armed forces of the United States.
The UCMJ applies to all active-duty members, activated National Guard and Reserve members, and military academy students. Some civilians serving in support of the military during wartime are also subject to the UCMJ.
The UCMJ does not preempt international law. Members of the military are subject to the laws of the United States, the laws of their host countries in times of peace under international treaties, and the UCMJ.
The preemption doctrine prohibits the application of Article 134 of the UCMJ to conduct covered by Articles 80 to 132. It prevents the government from eliminating elements from congressionally established offenses to ease their evidentiary burden at trial.
The President has the constitutional power to execute and enforce the laws contained in the UCMJ. The President creates and maintains the Manual for Courts-Martial (MCM), which includes the penalties for breaking the laws prescribed by Congress.


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