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19. What disadvantage is an advancing infantry at when facing a fortified hill? 3 to 1 20. By 1969, what percent of American casualties were aged 21 or younger? 60% 21. What is Hill 937 also known as? Hamburger Hill 23. What happened to Hamburger Hill after the US troops left it? The NVA took it back 24. Who is the president of the US in 1969 ... ................
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