By the look of the folks that side of the house it seems to be who can eat the most.
Aren't you 65 guys required to be on the weight program until the re-engining of the 65's takes place; you know, big guy + underpowered aircraft = limited hoist capability? I keed, I keed.
Aviators are like Oscars:icon_fish...they grow to the size of the aircraft they are flying. Hence, many C-130 pilots are big muscular types...with most of the muscle around their waist. Two box lunches per flight helps too.