http://www.slate.com/articles/news_and_politics/war_stories/2002/01/ignorad.html …pic.twitter.com/GI5LDrCXQX
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You can go like 1800 in those things. What were they waiting for? An invitation? Even if you don't know the plane's intent the first step is to make visual contact, so you can let the pilot know he is way off course.
This is default RoE in NATO and elsewhere in order to minimize accidental shoot-downs.
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