Has he registered for selective service, or does he have those pesky genetic bone spurs that allow you to play football, baseball, soccer, and wrestling while attending military school, but prevent you from actual military service?
Most people in the US get automatically registered by their state DMV to the feds, but you’re technically responsible for doing it even if you don’t get a driver’s license
It's a "draft" sign up everyone signs when they register to vote or get thier drivers license. Since there's no longer a draft it's basically just saying yes to maybe being selected for jury duty someday.
I won't say that won't happen, but they will call back all the inactive reserves first. The 1st time you sign an active duty contract, you sign up for 8 years total. Everyone does. It normally is 4 years active and 4 years inactive, but sometimes it's 5 and 3 or 6 and 2.
They called people back in '02, '03 during OEF/OIF. It's easier to call people with prior training back then train 100% new one.