TIL mobile defesne missions can turn into exterminations

I've been playing this game for like 4-5 years, Im sure I've done hundreds of this missions and yet today this is the first time it happened to me, is the chance that low, or am I just really unlucky (or lucky)?

I genuinely thought the game bugged or something

submitted by /u/ChiffonPink
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source https://www.reddit.com/r/Warframe/comments/xpwxbn/til_mobile_defesne_missions_can_turn_into/