Somewhere around 3 am when I was a boot, a couple NCO’s in my platoon kicked open my/my squadmate’s barracks door, got us up, and made us shotgun beers until almost all of an 18 rack was gone, then left, wishing us luck for the 15-mile full gear hike at 0430. If there’s anything that’s linked to alcoholism, it’s the infantry culture.
I think you could probably find a link between meatheads who lift so they can thump their chest and bros who get wasted so they can thump their chests. Doesn’t mean one leads to the other, just means that the personalities that seek out one might overlap in a venn-diagram-y kind of way with the personalities that seek out the other.