Army Active Duty 472,047 Army National Guard 345,153 Army Reserve 219,054 I believe a significant number of soldiers also only do 4 or 8 years and then retur

Army Active Duty 472,047 Army National Guard 345,153 Army Reserve 219,054 I believe a significant number of soldiers also only do 4 or 8 years and then return to civilian life, they aren’t a permanent military class like the Roman legions or whatever. As you mention a lot depends on what you consider a “citizen soldier” though.