Congratulations. The card will grow at a 3x rate in the 1st year. 91/3 apply for CLI, 6 mo apply, then at 1 year auto increase. Call CS to turn on auto increase feature on the card. Use it regularly, so Navy can access your need for more credit.
IMO, in 6 mo. apply for your 2nd Navy card, plus see if you can get a secured Discover card.