Local dealer told me he has sold close to 100 Destroyers and hasn't had one come back derailed. I have seen a Destroyer derailed but I've seen several other models and makes as well.
Too long a draw, too much poundage, and/or torquing on let down are usually culprits. Short A to A bows with big cams are easier to derail than some other design.
I have shot the D-350 quite a bit and have never had it derail. I have even tried to purposely derail it while at full draw but as far as I am concerned it would be impossible.
On let down? I'm sure that's a different story!
You stay safe over there! We all appreciate your service!
Dan