Wow!! Very good to know. I will be doing a compare/contrast Green v PRG to see which one is better suited for me. When you say tight leash for the PRG-- does that mean less frequent CLI's?
It's a charge card with NPSL. The real charge limit will grow with time and use. There is no 'credit' limit, though, since you have to pay in full or get permission from them
to pay something like a 30%+ APR.
I guess the PRG could be useful for getting rewards on flights, but keep in mind that if you ever go off active duty (which I think you said you were), you might find it necessary to close a few cards to save on annual fees. That could hurt your AAoA.
On the other hand, it is good that the MR points are all pooled together, so you don't have to redeem each card's rewards in isolation.