US-led intervention in Iraq (2014–2021)

Definition
The US‑led intervention in Iraq (2014–2021) was a multinational military campaign, directed by the United States and conducted under the umbrella of Operation Inherent Resolve, aimed at defeating the Islamic State of Iraq and the Levant (ISIL) and supporting Iraqi and Kurdish forces in regaining territory seized by the group.

Overview

• Timeframe: 15 June 2014 – 9 December 2021 (combat phase); limited advisory presence continued beyond 2021.
• Primary Objective: Counter ISIL’s rapid expansion in northern Iraq, restore Iraqi government control, and dismantle the group’s territorial holdings.
• Coalition: Over 30 countries contributed personnel, aircraft, and equipment, forming the Combined Joint Task Force – Operation Inherent Resolve (CJTF‑OIR). Key contributors included the United States, United Kingdom, Australia, Canada, France, Germany, Italy, the Netherlands, and several others.
• Operations: Airstrikes, intelligence, surveillance, reconnaissance (ISR), special‑operations raids, and extensive training and advisory missions for the Iraqi Armed Forces, Kurdish Peshmerga, and local militias.
• Results: By December 2017 Iraq declared a military victory over ISIL. Tens of thousands of ISIL fighters were killed, and ISIL lost almost all of its territory in Iraq. A low‑intensity insurgency persisted after the territorial defeat. The coalition ended its combat mission in December 2021, transitioning to an advisory and assistance role. Approximately 2,500 U.S. personnel remained in Iraq to train and assist local forces as of the end of 2021.

Etymology / Origin
The phrase “US‑led intervention in Iraq (2014–2021)” derives from the United States’ leadership of the multinational coalition that launched Operation Inherent Resolve in response to ISIL’s June 2014 offensive in northern Iraq. The term is used in academic and media sources to distinguish this specific phase of U.S. involvement from earlier conflicts (e.g., the 2003 invasion of Iraq) and from parallel operations in Syria.

Characteristics

• Command Structure: CJTF‑OIR, headquartered in Kuwait, with U.S. Central Command (CENTCOM) providing overall strategic direction.
• Force Composition:
  • United States: 5,200–6,000 troops, plus ~7,000 contractors; carrier strike groups, fighter squadrons, bombers, ISR platforms, and drones.
  • Coalition partners contributed aircraft (e.g., F‑16s, Rafales), naval assets, ground advisers, and special‑operations forces.
• Operational Phases:
  1. Initial Air Campaign (2014‑2015): Intensive bombing of ISIL positions, support for Iraqi and Kurdish ground advances.
  2. Ground Advisory & Training (2015‑2020): Expansion of U.S. and coalition advisory teams embedded with Iraqi and Kurdish units.
  3. Transition & Drawdown (2020‑2021): Gradual reduction of combat operations, culminating in the formal end of the combat mission in December 2021.
• Legal Basis: Conducted at the invitation of the Iraqi government, which authorized foreign assistance to combat ISIL.
• Humanitarian Component: The coalition also coordinated humanitarian aid, reconstruction assistance, and stabilization programs for liberated areas.

Related Topics

• Operation Inherent Resolve – the broader coalition effort encompassing Iraq and Syria.
• War against the Islamic State – the global campaign to defeat ISIL.
• US intervention in the Syrian civil war – parallel operations conducted by the same coalition in neighboring Syria.
• War in Iraq (2013–2017) – the internal Iraqi conflict that overlapped with the US‑led intervention.
• Islamic State insurgency in Iraq (2017–present) – the post‑territorial phase of ISIL activity.
• Combined Joint Task Force – Operation Inherent Resolve (CJTF‑OIR) – the command entity coordinating coalition actions.

All information presented is derived from publicly available sources, principally the Wikipedia article “US‑led intervention in Iraq (2014–2021)” and related official U.S. Department of Defense publications.