NMAA is a good organization but I cannot say that their term rates are significantly better than USAA, AFBA or other such organizations. Their finances are very solid.
I have had a small $20k whole life (the Permanent Plus) policy with NMAA since I was a 2ndLt because it was offered in conjunction with a loan to buy uniforms. The policy was fully paid up after 20 years and was to have a death benefit at that time of $20k and begin increasing therafter but it has performed a bit better and is already at $27k after 23 years of paying into it. While I have most of my life insurance in term policies (SGLI, NMAA, MetLife) the small whole life policy that is now completely paid off may come in handy if I decide to cash it out.