I've had a problem for a long time now, and I'm finally asking for help. I work in an acronym intensive field (an AIF, if you will), and I haven't the foggiest glimmer of a clue about how to properly pluralize acronyms. I looked it up on wikipedia, and instantly fell into a deep, dreamless slumber. Any English majors and/or usage enthusiasts here that can illuminate the depths of this particular mystery for me? GFE's, GFEs? Without the comma, it just makes my eyes itch; with the comma, it burns my soul. HELP!