Supreme Allied Commander Europe (SACEUR)
The Supreme Allied Commander Europe, commonly known as SACEUR, is the commander of the North Atlantic Treaty Organization's (NATO) Allied Command Operations (ACO). This role serves as the head of the Supreme Headquarters Allied Powers Europe (SHAPE), the operational headquarters based in Casteau, Belgium. In the hierarchy of NATO, SACEUR holds the second-highest military position, surpassed only by the Chair of the NATO Military Committee.
While SACEUR focuses on operational command, NATO also maintains a Supreme Allied Commander Transformation (SACT) based in Norfolk, Virginia. While titularly equal, SACT is responsible for capability development rather than active military operations.
By long-standing tradition, the SACEUR is always a United States military officer. The role is "dual-hatted," meaning the individual simultaneously serves as the Commander of the United States European Command.
Key Facts
- Current Incumbent: General Alexus G. Grynkewich (since 4 July 2025).
- Headquarters: SHAPE, located in Casteau, Mons, Belgium.
- Appointment: Nominated by the President of the United States (with Senate advice and consent) and appointed by the North Atlantic Council.
- Establishment: Formed on 2 April 1951.
- First Holder: General of the Army Dwight D. Eisenhower.
- Reporting Line: Reports to the North Atlantic Council via the NATO Military Committee.
Command Structure and Leadership
The SACEUR oversees the strategic military operations of the alliance. Since 2003, the role has also encompassed the leadership of Allied Command Europe and Allied Command Operations. The commander resides at the Chateau Gendebien in Belgium.
The Deputy Supreme Allied Commander Europe (DSACEUR)
The Deputy Supreme Allied Commander Europe (known since 2003 as the Deputy Head of Allied Command Operations) provides critical support to the SACEUR. By tradition, this position is always held by a British or German military officer.
The structure of the deputy role has evolved over time. From April 1951 to January 1978, there was a single DSACEUR. Between January 1978 and June 1993, the role was split between two deputies—one British and one German. Since July 1993, the position has reverted to a single officer.
Integration with European Union Missions
Under the Berlin Plus agreement of 2002, SHAPE can function as an operational headquarters (OHQ) for European Union (EU) missions. In these scenarios, the DSACEUR—who is always a European—serves as the Operation Commander (OpCdr).
This arrangement is subject to a "right of first refusal," meaning NATO must first decline to intervene in a crisis before the EU utilizes SHAPE. Furthermore, such cooperation requires unanimous approval from all NATO member states, including those that are not members of the EU.
SACEUR Summary Table
| Attribute | Detail |
|---|---|
| Full Title | Supreme Allied Commander Europe |
| Headquarters | Supreme Headquarters Allied Powers Europe (SHAPE) |
| Location | Casteau, Mons, Belgium |
| Traditional Nationality | United States |
| Dual Role | Commander of US European Command |
| Reporting Body | North Atlantic Council |
Frequently Asked Questions
Who is the current SACEUR?
The current Supreme Allied Commander Europe is General Alexus G. Grynkewich of the US Air Force, who took office on 4 July 2025.
What is the difference between SACEUR and SACT?
SACEUR is responsible for the operational command of NATO forces, while the Supreme Allied Commander Transformation (SACT) focuses on the development of military capabilities and transformation.
How is the SACEUR appointed?
The President of the United States nominates the candidate, subject to the advice and consent of the Senate. The final appointment is made by the North Atlantic Council.
What is the role of the DSACEUR?
The Deputy Supreme Allied Commander Europe supports the SACEUR and, by tradition, is a British or German officer. Under the Berlin Plus agreement, the DSACEUR can also serve as the Operation Commander for EU missions.
Where is the SACEUR based?
The SACEUR is based at the Supreme Headquarters Allied Powers Europe (SHAPE) in Casteau, Mons, Belgium, and resides at Chateau Gendebien.