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However, you can quit out of a mission after fulfilling a Mission Task, but only after triggering a checkpoint save by entering or leaving an area. For example, you cannot extract someone and kill them from at least 100m with a sniper rifle in the same run of a mission. Many can be done at the same time however, others are completely exclusive from the other and require multiple playthroughs. While you can complete a number of Mission Tasks without knowing what they are (some are mandatory), you'll be able to see all of them in your iDroid after finishing the mission once. You should really only try to complete these tasks after earning an S Rank, because some of them will be completed through the methods involved in earning those S Ranks. Mission Tasks are separate from S Ranks but are similar in that they're only specific to Main Ops.
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