Terms from the card website:
# Earn 5.00% cash back from gas purchases paid at the pump
# Earn 1.25% cash back from all net purchases you make with the card during each billing cycle
Net purchases: new monthly purchases minus returns and credits. Rewards are available only for new monthly purchases made with the card: cash advances, checks drawn from the account, and balance transfers are excluded and do not earn credit toward rewards. Certain limitations apply to the Visa Platinum Rewards Program.
You can become eligible for CU membership via National Military Family Association (NMFA)