DEFENDER: A Legacy of Strength and Commitment

 

For five years, the Dynamic Employment of Forces to Europe for Deterrence and Enhanced Readiness (DEFENDER) exercise series has been the cornerstone of the U.S. Army’s commitment to European security. It has proven our ability to rapidly deploy combat-credible forces across the Atlantic, integrate with NATO Allies and partners, and demonstrate the strength of our collective resolve.

DEFENDER was not just an exercise; it was a visible and powerful affirmation of unity, readiness, and deterrence.

 

DEFENDER LogoSword logo

 

From DEFENDER to Sword: A Strategic Transition

DEFENDER accomplished what it set out to do: validate the ability of U.S. forces to deploy rapidly, operate effectively alongside Allies, and deter aggression. It strengthened NATO’s collective defense posture and built trust among partner nations.

The new Sword exercise series shifts the focus of the exercise to in-place forces alongside increasingly lethal Allied land forces assuming more responsibility for the defense of Europe. For U.S. forces, it’s a platform for integrating cutting-edge capabilities, such as AI-enabled command and control systems, and multi-domain operations.

For more information on Sword and related exercises, visit the Sword website.

Building Readiness, Strengthening Alliances (2020-2025)

Launched in 2020, DEFENDER was designed to test and validate the ability of U.S. forces to deploy from bases in the United States to operational areas across Europe. Over the years, it grew into one of the largest and most complex multinational exercises in modern history, showcasing the capabilities of U.S. and Allied forces working together to protect NATO’s Eastern Flank.

Key operational achievements include:

  • Strategic Force Projection: DEFENDER repeatedly demonstrated the ability to deploy thousands of U.S.-based Soldiers and their equipment across Europe with speed and precision, ensuring readiness to respond to any crisis.
  • Command and Control Modernization: The exercise integrated the newly reactivated V Corps into the command structure, enhancing the ability to lead large-scale Allied operations and strengthening NATO’s collective defense posture.
  • Prepositioned Stocks: Drawing on Army Prepositioned Stocks (APS) in Europe, DEFENDER proved the ability to equip forces rapidly, ensuring they were ready to fight upon arrival.
  • Alliance Integration: In 2024, DEFENDER was directly linked to NATO’s Steadfast Defender, the largest Alliance exercise in decades, showcasing seamless U.S. contributions to collective defense and reaffirming the strength of the transatlantic bond.
DEFENDER in a Time of Crisis

The initial DEFENDER in 2020 was executed during the global COVID-19 pandemic, showcasing the resilience and adaptability of U.S. and Allied forces. Despite the challenges posed by the pandemic, the exercise maintained its focus on readiness and interoperability, proving that even in the most difficult circumstances, the mission endures.

 

DEFENDER’s importance was underscored in 2022, when the exercise was conducted against the backdrop of Russia’s invasion of Ukraine. DEFENDER 22 became more than a training event, it was a demonstration of NATO’s unity in the face of aggression. It sent a clear message to European partners and adversaries: The Alliance is unified, capable, and ready to defend every inch of NATO Territory.

 

This real-world context transformed DEFENDER into a critical act of deterrence, highlighting the importance of readiness and the strength of Allied partnerships during one of Europe’s most challenging moments in recent history.

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Video by Staff Sgt. Karla Parra
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B-roll: Immediate Response 25 - Bulgarian Land Forces band welcomes Bulgarian Minister of Defense, Atanas Zaprianov
5th Mobile Public Affairs Detachment
June 10, 2025 | 1:08
Bulgarian Land Forces band welcomes Bulgarian Minister of Defense, Atana Zaprianov concluding Immediate Response 25 at Koren Training Area, Bulgaria, June 9, 2025. As a direct link to Immediate Response, Balkan Sentinel consists of a battalion from U.S. Army 3rd Brigade Combat Team, 1st Armored Division, one Forward Land Forces (FLF) multinational battlegroup and the Bulgarian Land Force Command conducting a battalion-level live-fire exercise at Novo Selo TA and Koren TA. The FLF is one of eight battlegroups contributing to NATO’s forward presence and is hosted by Bulgaria, with Italy being the framework nation. (U.S. Air Force video by Staff Sgt. Karla Parra )
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