Some countries let people join at 18 but they cannot fight until 20 or older. Essentially the first years are spent in military school and or in a kind of reser

Some countries let people join at 18 but they cannot fight until 20 or older. Essentially the first years are spent in military school and or in a kind of reserve role. It is an interesting compromise that still let's people join up instead of college around 18/19 but with fewer moral hazards.