My 12 YO is fed a steady diet of WWII documentaries, movietone reels, and as much family history of WWII and WWI as we can dredge up.
Not hard to get him to watch.
And we include the War of Northern Aggression / War of the Rebellion history of his NC ancestors, who fought on both sides...and of course the motherlode, the Revolutionaries of the Piedmont, who included the Regulators....which is where ALL of this started!!!
We live in NC and I take them to historical sites and show them old war movies, all three of my kids watch them. Lots of great history here! I love the swamp fox, and now I will study the regulators.