Officially, the Navy switched from alcohol to ice cream. Unofficially, when I served in the US Navy in the 2000s I was surrounded by the most extreme levels of alcohol consumption I'd ever seen, by far. In the US Navy today, on any ship you will find people who get blackout drunk several nights per week every week. Junior and senior. The Chief of the Boat on my submarine regularly showed up to work drunk, haven driven himself to work. The Topside Watch reported him multiple times and it was always swept under the rug. We had nuclear reactor operators who snuck bottles of liquor onto the ship to drink while at sea. It was standard practice for Chiefs to take their divisions to bars and pay for their drinks all night so they could be drunk and immobile under Chief's supervision instead of drunk and mobile out in public. Our head Engineering Officer made a joke one day how it wasn't a problem that one of the reactor operators was drunk because "this is nothing new, we always start the reactor up drunk during WestPac". Extreme alcoholism is still rampant in the US Navy, and that includes among the people who operate the nuclear power plants and the people who guard the nuclear weapons. But yes, they also have ice cream now.