The Air Force's top uniformed leader said that planners need to consider vulnerabilities at military sites once thought untouchable by enemy forces.
This V-E Day marks the 80th anniversary of Nazi Germany's surrender to Allied forces.
The F-16s being shipped to Ukraine lack critical components like an engine and radar, the Air Force said, meaning they cannot be used operationally.
The commander's comments come amid concerns from Congress that the Pentagon is considering reducing the number of U.S. troops on the continent.
