grognard

noun4

1. •
   An old soldier.
2. •
   (historical) A soldier of the original imperial guard that was created by Napoleon I in 1804 and that made the final French charge at Waterloo.
3. •
   (slang) Someone who enjoys playing older war games or roleplaying games, or older versions of such games, when newer ones are available, and often complains frequently about newer games.

   • James is such a grognard: he only plays the original edition of Dungeons & Dragons.
4. •
   A soldier or military enthusiast who pays meticulous attention to rules, details, and traditions, often respected for their expertise in areas that others might overlook.