A United States Army service member was arrested in the UK, following an investigation conducted by Counter Terrorism Policing, U.S. authorities, and the Federal Bureau of Investigation (FBI). According to the U.S. Army, the unnamed 41-year-old U.S. Army soldier was arrested near the city of Gloucester under the National Security Act of 2023.
Investigative officers were also carrying out searches at two locations in Gloucestershire.
“This significant arrest and investigation is a result of close collaboration between UK and US authorities,” said Deputy Assistant Commissioner Vicki Evans, senior national coordinator for Counter Terrorism Policing. “The allegations are serious, and our investigation is very much ongoing. This activity demonstrates the strength of our UK and US law enforcement and national security partnerships, and I commend the work of all the teams involved. We will work together to take robust action against those we suspect of any criminal activity that could undermine our national security.”
The exact nature of any alleged crime wasn’t disclosed, but the U.S. Army stated it involved Russia. Authorities stated that the arrest is not linked to the other ongoing counterterrorism investigations, including a separate recent incident involving RAF Fairford in September.
An unidentified case of potential Army espionage
The United States Army also hasn’t disclosed the individual’s name or rank. CNN reported on Tuesday that the soldier was a field-grade U.S. Army officer “assigned to the Allied Rapid Reaction Corps,” a British-led NATO unit based in Gloucester, England. Field grade ranks include O4 to O6, or major, lieutenant colonel, and colonel.
“This case demonstrates the strength of our partnerships and the resolve of the counterintelligence community,” said Brig. Gen. Sean Stinchon, commanding officer of the US Army Counterintelligence Command. “I am grateful to the UK and the FBI for their professionalism and teamwork throughout this investigation. The alleged conduct of a senior soldier, entrusted with sensitive information, is a sobering reminder that insider threats are real and persistent. I encourage anyone who thinks they’ve witnessed something suspicious to report it to their local counterintelligence office.”
Arrested Under The UK’S 2023 National Security Act
The U.S. Army acknowledged that the individual, who is now being held in custody at a London police station, was detained under the NSA 2023, and specifically Sections 1 and 3. The former prohibits obtaining, copying, recording, or disclosing protected information that might prejudice the safety or interests of the United Kingdom. In contrast, the latter section prohibits materially assisting a foreign intelligence service in carrying out UK-related activities, including directly or indirectly providing foreign intelligence information, goods, services, or financial benefit.
“This important arrest involves allegations of espionage, which is of the utmost concern to the United States and our allies. While this investigation is continuing, I want to send a clear message. This FBI has no tolerance for anyone who breaks their oath to the United States and whose actions endanger our national security and that of our partners. This includes 167 counterintelligence and espionage arrests from this FBI over the last 21 months – a 53 percent increase,” said FBI Director Kash Patel. “This matter shows that partnerships are essential to protect our countries, and I want to express my thanks to UK Counter Terrorism Policing, MI5, UK Defense Counter-Intelligence, and the US Army Counterintelligence Command for their outstanding work.”
The arrest is also a reminder of the enduring value of the Five Eyes intelligence alliance between the United States, United Kingdom, Canada, Australia, and New Zealand. At a time when adversaries like Russia and China are increasingly looking to exploit trusted insiders, intelligence-sharing relationships aren’t simply diplomatic niceties. They’re essential national security capabilities.
The Five Eyes partnership is built on decades of intelligence cooperation, shared security interests, and a recognition that threats to one partner can quickly become threats to all. That cooperation is particularly important when it comes to counterintelligence, where identifying suspicious activity, connecting intelligence across borders, and acting quickly can mean the difference between preventing a compromise and responding to one.
While the allegations against this soldier remain under investigation, the coordinated response from U.S. and UK authorities demonstrates something worth protecting: America’s intelligence partnerships are among its greatest strategic advantages. The Five Eyes alliance doesn’t eliminate the insider threat, but it helps ensure that when trust is potentially betrayed, our allies aren’t working alone to uncover it.
