Does your balance on your military star card renew every month?

I just got the star card and I was wondering if I got the same amount every month or if my limit is for every 6 months or something? I'm new to this military thing so I would like to know so I don't go over.|||Your Star Card is a credit card. And just like every other credit card you have a credit limit. So, if you have a limit of $2000 and charge $1500, then you have $500 left. Now, if you only pay $100, then next month you have only have $600 left on your credit limit.