The biggest thing on the planet right now.
Within moments the Internet had exploded. The dog got a meme going, instantly. Within the hour the dog had its own Twitter account (named @CollarDuty, naturally), which is just about to hit 15,000 followers. Many humourous dogs-in-military-situation photos followed, such as:
"There he is, the guy with the mail bag. Three rounds rapid!"
The games console you just spent five years and hundreds of millions of dollars working on? Nobody gives a toss, because a game has a dog in it. And it's not even the first game to do so (and in ARMA 2 you can even play as the dog, if you fiddle around with settings).
Ladies and gentlemen, the internet in action.