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Are you currently a member of both NFCU and Penfed? If so, you shouldn't have a problem apping for a card.
With NFCU I noticed that they want to see a little something. Whether you're putting decent cash flow through your checking etc. With a 700 score they may notch you at limited credit history. You should be able to do a quick recon though. Give it a shot. Aim for the Cash or Go Rewards. They'll prob hook you up around $2500-5k to start with. Worst case get an Nrewards.. after 91 days app for a second car and boom you're golden.