Operation Inherent Resolve in the context of "1st Armored Division (United States)"

Combined arms is an approach to warfare that seeks to integrate different combat arms of a military to achieve mutually complementary effects—for example, using infantry and armour in an urban environment in which each supports the other.

According to the strategist William S. Lind, combined arms can be distinguished from the concept of "supporting arms" as follows:

On 15 June 2014 U.S. President Barack Obama ordered United States forces to be dispatched in response to the Northern Iraq offensive (June 2014) of the Islamic State (ISIL), as part of Operation Inherent Resolve. At the invitation of the Iraqi government, American troops went to assess Iraqi forces and the threat posed by ISIL.

In early August 2014, ISIL began its Northern Iraq offensive. On 5 August, the United States started supplying the Kurdish Peshmerga forces with weapons. On 8 August, the United States began airstrikes against ISIL positions in Iraq. Nine other countries also launched airstrikes against ISIL, more or less in concert with Kurdish and Iraqi government ground troops. By December 2017, ISIL had no remaining territory in Iraq, following the 2017 Western Iraq campaign.

On 22 September 2014, the United States officially intervened in the Syrian civil war with the stated aim of fighting the Islamic State (ISIL/ISIS) militant organization in support of the international war against it, code named Operation Inherent Resolve. The US currently continues to support the Syrian Armed Forces under the transitional government and the YPG-led Syrian Democratic Forces.

Shortly after the start of the civil war in 2011, the Obama administration placed sanctions against Syria and supported the Free Syrian Army rebel faction by covertly authorizing Timber Sycamore under which the Central Intelligence Agency (CIA) armed and trained rebels. Following the Islamic State's occupation of Eastern Syria in August 2014, the United States conducted surveillance flights in Syria to gather intelligence regarding the Islamic State. In September 2014, the United States-led coalition—which involves the United Kingdom, France, Jordan, Turkey, Canada, Australia, and others—launched an air campaign against the Islamic State and al-Nusra Front inside Syria.

Combined Joint Task Force – Operation Inherent Resolve (CJTF–OIR) is a joint task force established by a U.S.-led international coalition against the Islamic State. Its stated aim is to "degrade and destroy" the Islamic State. Led by United States Army Central (ARCENT), it is composed of military forces and personnel from over 30 countries.

Formed in October 2014 by United States Central Command, CJTF-OIR was intended to replace the ad hoc arrangements that had been established to coordinate operations against ISIL, following its rapid gains in Iraq in June. Operation Inherent Resolve included the US-led intervention in Iraq (2014–2021) and the American-led intervention in the Syrian Civil War. The current commander of the coalition is U.S. Army Brigadier General Kevin J. Lambert and the current Command Senior Enlisted Leader is U.S. Army Command Sergeant Major Robert M. Preusser Jr.

The United States Central Command (USCENTCOM or CENTCOM) is one of the eleven unified combatant commands of the U.S. Department of Defense. It was established in 1983, taking over the previous responsibilities of the Rapid Deployment Joint Task Force (RDJTF).

Its area of responsibility (AOR) includes the Middle East (including Egypt in Africa), Central Asia and parts of South Asia. The command has been the main American presence in many military operations, including the Persian Gulf War's Operation Desert Storm in 1991, the war in Afghanistan, as well as the Iraq War from 2003 to 2011. As of 2015, CENTCOM forces were deployed primarily in Afghanistan under the auspices of Operation Freedom's Sentinel, which was itself part of NATO's Resolute Support Mission (from 2015 to 2021), and in Iraq and Syria as part of Operation Inherent Resolve since 2014 in supporting and advise-and-assist roles.

The 1st Cavalry Division ("First Team") is a combined arms division and is one of the most decorated combat divisions of the United States Army. It is based at Fort Hood, Texas. It was formed in 1921 and served during World War II, the Korean War, the Vietnam War, the Persian Gulf War, with the Stabilization Force in Bosnia and Herzegovina, the Iraq War, the War in Afghanistan as well as Operation Freedom's Sentinel and Operation Inherent Resolve. As of July 2023, the 1st Cavalry Division is subordinate to the III Armored Corps and is commanded by Major General Thomas M. Feltey.

The unit is unique in that it has served as a cavalry division, an infantry division, an air assault division and an armored division during its existence.

The military history of the United States spans over four centuries, dating back to 1607 and pre-dating by nearly two centuries the founding of the nation following the American Revolutionary War. During this moment, the United States evolved from a colonial territory to newly formed nation following its independence from the Kingdom of Great Britain (1775–1783) to ultimately becoming a world superpower in the aftermath of World War II and through the present. As of 2024, the United States Armed Forces consists of the Army, Marine Corps, Navy, Air Force and Space Force, all under the command of the Department of Defense, and the Coast Guard, which is controlled by the Department of Homeland Security.

In 1775, the Continental Congress, convening in present-day Independence Hall in Philadelphia, established the Continental Army, the Continental Navy, and the Continental Marines, formally joining and escalating its war for independence in the Revolutionary War. This newly formed military, fighting alongside the Kingdom of France, triumphed over the British in the war, leading to its independence following the signing of the Treaty of Paris in 1783. In 1789, the new Constitution made the U.S. president the commander-in-chief, and gave Congress the authority to declare war. Major conflicts involving the U.S. military include the American Revolutionary War, American Indian Wars, War of 1812, Mexican–American War, American Civil War, Spanish–American War, World War I, World War II, Korean War, Vietnam War, Gulf War, War in Afghanistan, Iraq War, and the war against the Islamic State.