Bridget may want to wring my neck for it, but alas I do use an apostrophe at the end of a plural acronym. Of course I know better than to do it otherwise. Now what really vexes me is when you see a sign posted in a store that reads:

THERE WILL BE A $15 SERVICE FEE FOR "ALL" RETURNED CHECKS

Even worse, I saw one that read "There is a $15 charge for 'EACH' returned checks." I had to go home and take an aspirin for that one.