This might be interesting - 2.4 is changing how the missions for ranking and permits is filled - maybe more permit missions will start appearing?
On mission boards there is only one slot for "Rank-up" missions, and engineer invitation missions fit in this slot (as do permit missions).
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In 2.4 we should see rank-up missions of all types generate more predictably as we've addressed a couple of issues in how the missions we try to spawn in that slot are chosen.
Thanks,
Dom