If World War 3 started would the US govt ask all men (18-45) available to join the army?

Anonymous
This guy I know from university said he's worried that if WW3 started the government would force men falling under a certain age bracket and capable (physically/mentally) to join the forces regardless, is that possible?
If World War 3 started would the US govt ask all men (18-45) available to join the army?
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