I think everyone should have a library card.
I'll wait a moment for the shocked murmuring to settle down.
Seriously, though, what's better than free entertainment? Most libraries have books, DVD's, audiobooks, tons of online resources and more available to cardholders.
So go get a library card, but be prepared! Most libraries are going to make you show a photo ID and something else (a current utility bill, rental agreement, a piece of mail, car registration) that shows proof of residence. I have never worked at a public library that didn't require this second type of proof of residency.
I am often frustrated when military folks come in with their military IDs and expect that to be enough to get them a library card. Sorry, its not (at least, not at any library I've ever worked at- not saying it might not be elsewhere!). The military folks often get frustrated with me, too. I understand how they feel, and often feel like commiserating- after all, my brown ID card gets me everything else, from groceries to free legal assistance, so why can't it get me a library card?
So save yourself some hassle: get a library card, but be prepared before you get there; you'll save yourself (and the person behind the desk) some frustration.
**Note: if you're setting up a library account at the base library, be prepared with your ID, your sponsor's duty phone number and unit, and other relevant information!**