If you've got Battlefield 3 and want the Close Quarters DLC for free, go to your Origin client, click "redeem code" and type in "BF3E3". Your welcome.
Worked, but just realized that this is the CoD style maps. :'( The End Game Air Superiority looks cool, but it's $50 for Premium or $15 for individual DLCs. :'( Double sad face.
Ya, this map pack was by far my least favorite, but it's free and it's still fun to play from time to time. I also like the weapons you can unlock from this one, especially the M417 semiautomatic sniper rifle.