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Note that you can only engage in one mission at a time, and it takes time to travel to and from missions, usually around at most 1 hour. When a mission appears in the Mission Control room, you have a certain amount of time to deploy to it before it disappears. Which zone you get is random, and some are significantly more difficult than others. For most standard missions with a deployment/extraction zone, many additional such zones have been added to each map as compared to vanilla.
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