For general discussion about XCOM: Long War
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You can earn XP from a single mission until just before rank after the next one. For example, let's say your soldier has 500/700 xp, so he needs 200 to the next rank and an extra 500 to the next rank (so 1200 xp). Then if you take them on a mission they will stop at 1199 xp and can't get any more for that mission.
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