Spies Helped the USAF Shoot Down a Third of North Vietnam’s MiG-21s Spies Helped the USAF Shoot Down a Third of North Vietnam’s MiG-21s Kris Osborn · June 9, 2020 Please leave this field emptyStay Updated with Warrior Maven Subscribe for daily military news and updates delivered straight to your inbox. We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.