Speaking of Vietnam, someone has been occasionally flying a UH-1D (or 204/205) past my area. The odd 60 isn't unusual around here, but that "whup-whup-whup" sound is unmistakeable even if you were born long after the end of the conflict like I was. I remember them from the late '80s and early '90s before they were replaced with newer, quieter generations of helicopter.
Just now:
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