I've had it happen only once on the Arms Dealer, and twice on Inverted Spire. It seems to be just a random chance (very low chance).
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You are right with a very low chance. I play strikes a lot....like really A LOT. 3 x i have had the tank. 2x in the armsdealer and 1x in the inverted spire. I must have played both strikes about 120--150 x.
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guess it's time to grind strikes then. that mission in the tunnels for the campaign was hands down my favorite.