Went to Leeuwarden Airbase yesterday for the excercise "Frisian Flag", the Dutch, much smaller, equivalent of Red Flag ! About 50 fighters from 9 countries are participating in this excercise. The conditions were very challenging. Rainy in the morning and grey all day. Not the best conditions for the Sigma 150-500, but tried to make the best of it. Here some shots:
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[Cee Cee]

awesome shots, were these taken at 500mm?

[ROBEFFY]

Seems like you nailed it!
Nice shots, even in crummy lighting!

[Snipes]

awesome shots, were these taken at 500mm?

No, not all of them. At Flickr you can see at how many mm's the shots were made.