I got mine from Ground War Domination. Took a few hours. In the end it came from rushing the B flag at the start of a match on Plaza. If you go in ground war and find a party on the enemy team, you'll make things a bit easier for yourself, as long as they're actually playing the objective.
Proud to be a farm animal until someone tells me otherwise.
Get a double kill with whatever weapon you're using, Fast Hands switch to the RPG and hope to Jesus that another enemy shows up soon and blow him up.
Just got my SMAW gold and had to do basically the same thing with the double kills. Though I got 2 for real double kills with the SMAW in a single game. These two dudes kept running together as a team and I caught them a couple times.
Big Money. Big Women. Big Fun. I don't have a cocaine habit, I just like the way it smells.