Two choppers collide at RAF Ternhill

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Sad news indeed.
Having just heard this in the radio, and as an aside, following a link from the RAF Shawbury Internet Site, a useful bit of information for Local Residents, and Livestock farmers wondering why their Cattle and Sheep are aborting...!
Not exactly a bright side, but I am surprised that only one was killed... they must have been very low and probably moving very slowly, or at least one of them was. Could've been much worse, for what that's worth... :-/
From what i grasped the helos were being used at the time for military pilot training so thats porbably why it was so low