Do not learn anything weapon systems related. It's changing every week.
I've had to relearn TGP 3-4 times, jdams 2-3 times, laser bombs 2 times, mavericks 2 times, INS system 2-3 times, ACM modes 3-4 times, missile performance million times - it constantly shifts my timelines, and so on, you get the point. Waste of time.
Even flight model is not finished, but at least it doesn't change every week.
Someone suggested at this forum that learning systems as they are being introduced will be easier. Completely untrue.