Redditor /u/PattonPending and their friends taught their commanding officer, a captain in the US Army, how to play Dungeons & Dragons. They wanted to schedule a campaign, but there were multiple scheduling conflicts. So the officer simply ordered the players to attend. Now playing Dungeons & Dragons wasn't simply an opportunity for them; it was a requirement under Article 92 of the Uniform Code of Military Justice.
/u/PattonPending assures us that the captain meant the memo as a joke and wouldn't actually make Dungeons & Dragons mandatory.
Read the whole thread for a lot of funny tabletop role-playing games stories from veterans.