I just did one Exploration2 mission, and I got two Exploration1 missions that I have done earlier. The latter have now showed up again, but how frequent are these missions? I would like to perform more Expl2 missions before I gain too many levels. I want to buy some equipment.
As it was, I became Lt. Commander before I was offered enough Expl1 missions so I had no use for those badges any more. Now I wonder if I'll become Commander before I get to use my Lt. Commander Exp2 gear