Force them to sit down with a beer and watch Starship Troopers (1997).
This is perhaps the greatest 'Nam movie ever made because it's one of the few (John Wayne's Green Berets and the Mel Gibson flick We Were Soldiers get honorable mention here) that doesn't say America is bad or ask you to feel guilty. On the contrary, it invites you to rejoice in the death of America's enemies, and to cheer their annihilation in any number of gruesome and satisfying ways. That’s because in this 'Nam parable, the VC and NVA are played by evil, insectoid-alien hell creatures.

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18