This comments section is wild. It's really a pretty simple post even if it's not spelled out as clearly as it could be; it's just saying in WW2 an allied bomber (American) was attacked with explosives by Nazi defenses (Germans during WW2) and was thwarted by Czech made blank anti-aircraft shells because they only pretended to work for the Nazis. Given current context, I assume the analogy is that now that Americans are the Nazis, you can still resist the regime by doing what the Czechs did.
That said, I don't really believe the story since it reads as "and everyone clapped" levels of evidence, but the overall message is fine. This is hope posting, anyway.
Edit: fixed a term