According to the creators of the original show shaggy is 17 in 1969 meaning in 1-2 years he'd be the perfect age for the draft. Fred was also 17, they'd probably have served together. The war didn't end until '75.
Edit : the original show ended in '70, just around the time they would've been subject to the draft . . .
[quote] coincidence? I THINK NOT![/quote]
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Like , zoinks gang, Charlie in the trees.