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NATO's Eastern Sentry — Interview with US Lt Col Brennan Gallagher
In this episode, Jose “Houdini” Davis sits down with U.S. Lieutenant Colonel Brennan “Thor” Gallagher, one of Allied Air Command’s key operational leads behind Eastern Sentry, NATO’s newest vigilance activity along the Alliance’s Eastern Flank. A U.S. Air Force Weapons School graduate, rescue C-130 pilot, and senior planner in AIRCOM’s A35 directorate, Thor brings deep operational and strategic expertise to a conversation that unpacks both the origin and the ambition of NATO’s Eastern Sentry.
Thor explains how Eastern Sentry emerged as NATO’s immediate response to repeated Russian drone violations in September — airspace intrusions that made clear the Alliance had to shift to a more proactive, integrated air defence posture. This evolution is not cosmetic; it represents a structural change in how NATO protects its populations and airspace. Instead of reacting to incursions, Eastern Sentry pushes sensors, shooters, aircraft, and cyber/space capabilities forward, creating a flexible defensive lattice from the Baltics to the Black Sea.
As the operational lead for Eastern Sentry, AIRCOM is working closely with LANDCOM, MARCOM, and other NATO entities, developing a “sensor-to-shooter ecosystem,” where land-based counter-UAS systems, maritime patrol aircraft, satellite-enabled ISR, and Airpower are bound together by command and control as the glue.
The episode also highlights how Eastern Sentry has triggered a surge of Allied contributions. Nations including Czechia, Germany, France, Denmark, and others have surged aircraft, sensors, and special operations helicopters to reinforce the integrity of NATO’s eastern airspace. These activities — mirrored in real-world events like the Rafale launch out of Poland during an Eastern Sentry alert — demonstrate the speed, cohesion, and credibility of the Alliance’s integrated response network.
Thor walks listeners through how Eastern Sentry is also becoming a proving ground for innovation, testing new counter-UAS technologies, mobile radar units, and rapid sensor-to-shooter links. In partnership with Allied Command Transformation and other NATO components, Eastern Sentry is evaluating systems already gaining traction, shaping what deterrence will look like on NATO territory in the years ahead.
Recorded Monday, 27 October 2025.
This is a public episode. If you would like to discuss this with other subscribers or get access to bonus episodes, visit natoaircom.substack.com
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By NATO Allied Air CommandIn this episode, Jose “Houdini” Davis sits down with U.S. Lieutenant Colonel Brennan “Thor” Gallagher, one of Allied Air Command’s key operational leads behind Eastern Sentry, NATO’s newest vigilance activity along the Alliance’s Eastern Flank. A U.S. Air Force Weapons School graduate, rescue C-130 pilot, and senior planner in AIRCOM’s A35 directorate, Thor brings deep operational and strategic expertise to a conversation that unpacks both the origin and the ambition of NATO’s Eastern Sentry.
Thor explains how Eastern Sentry emerged as NATO’s immediate response to repeated Russian drone violations in September — airspace intrusions that made clear the Alliance had to shift to a more proactive, integrated air defence posture. This evolution is not cosmetic; it represents a structural change in how NATO protects its populations and airspace. Instead of reacting to incursions, Eastern Sentry pushes sensors, shooters, aircraft, and cyber/space capabilities forward, creating a flexible defensive lattice from the Baltics to the Black Sea.
As the operational lead for Eastern Sentry, AIRCOM is working closely with LANDCOM, MARCOM, and other NATO entities, developing a “sensor-to-shooter ecosystem,” where land-based counter-UAS systems, maritime patrol aircraft, satellite-enabled ISR, and Airpower are bound together by command and control as the glue.
The episode also highlights how Eastern Sentry has triggered a surge of Allied contributions. Nations including Czechia, Germany, France, Denmark, and others have surged aircraft, sensors, and special operations helicopters to reinforce the integrity of NATO’s eastern airspace. These activities — mirrored in real-world events like the Rafale launch out of Poland during an Eastern Sentry alert — demonstrate the speed, cohesion, and credibility of the Alliance’s integrated response network.
Thor walks listeners through how Eastern Sentry is also becoming a proving ground for innovation, testing new counter-UAS technologies, mobile radar units, and rapid sensor-to-shooter links. In partnership with Allied Command Transformation and other NATO components, Eastern Sentry is evaluating systems already gaining traction, shaping what deterrence will look like on NATO territory in the years ahead.
Recorded Monday, 27 October 2025.
This is a public episode. If you would like to discuss this with other subscribers or get access to bonus episodes, visit natoaircom.substack.com