did you know that there are slot machines in american military bases all over the world? you will not be finding a full blown casinos in there but these machines offer enough entertainment to their soldiers i believe.
Initially, gambling was expected to be seen as a means to why people can come together and have fun, so if in the military camp you discover any form of being entertained there, then it should not be a surprise, because they also need to ease their own self from the struggles in this profession and get entertained in various ways, since most of them may not be able to have access in going to the casino mingling with the civilians, if they gamble together within their territory, i don't think its something bad, after all, gambling is entertaining.