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You need to request an increase on your NavChek (Checking Line of Credit) CL, they will not automatically increase your CL for you. You just call them up and request an increase, or go to Account Services and request it online.
be sure to request to the max of $15k... Navy seems to give out the max on NavCheck easier then any other card and with the HP it's always just wasted when people don't ask for it.... worse case, Navy will counter if they won't approve full $15k.