Congratulations to your fiance Marissa! I just knew it was AGRho the whole time, but that's probably cause they sounded just like the guys at my school. When I was a freshman and sophomore they had a really laid back, awesome chapter just like you described. They were smaller, but still had probably around 20 members or so and I loved hanging out with them. Unfortunately by the time I graduated they were down to only a couple guys because they had so many graduate (and because the university pretty much shut down the ag program).
But they were great guys, and I wish your fiance the best with his chapter!