It just means this Thread is OURS! ALL OURS! HAHAHAHAHAHAHAHAHAHAHA!
CNA is Campaign for North Africa, one of the last (true) SPI games, a company/battalion level game of (guess what?) North Africa 1940-42.
It's the only game ever made that I know of to have realistic supply rules.
So it's like, you must manage items like POL, water, ammo, food, spare parts and maybe a few others. vehicles break down, so you must repair them using spare parts brought up to the field workshops by trucks that break down, too, apart from using up POL for themselves and food & water for theirs crews.
All that before firing a single shot, of course. Just getting there's a headache... (as it actually was)
And then, supposing you won a battle, you get POWs who need to be fed and brought back to POW cages thousands of miles away using up transport, and...
Oh, and if you've managed to capture ennemy vehicles, not only can you use them, but you also can modify them to suit your tastes...
I've never played it (we had plans, a few years ago...), but I've read the rules and one of my friend actually has played a small scenario.
Nobody ever reported completing a game, even the playtesters.