Well I can tell you from experience... You need something to take you mind off of work, especially when it comes to soldiers in a confined space for extended periods of time. They probably go with intramural, since they aren't going to go against the Yankees anytime soon and they probably won't ever invite anyone in to compete against.
American tax dollars hard at work providing entertainment, so that those Joe's (soldier speak, meaning: average soldiers/workers) can keep doing their job. As a civilian I can see the questions but as a soldier I understand the justification. I'm just impressed that they let google earth get that close!