On one of the Mars missions (i think the garden spire or whatever it's called) if you kill the last boss fast enough the two drop ships will glitch out and hang out till you finish the mission. Test it out there. I havent been able to but I also didn't try for very long at all. I do know you CAN destroy the turrets tho
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Did this on a low level run of the cabal dude. Is this that mission? lol. so yeah, it happened for me.
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It works