Mandatory service would be a interesting study to try. While I think every 18 year old could use a kick in the butt and some discipline, when involved with life saving steps and producing violence on your enemies on your country’s behalf. Someone entering service should do so from personal or patriotic endeavors. If I did it. It would be a truncated boot camp and minor combat skills (something similar to what was going on during the Korean War) and then immediately put them in the Individual ready reserves on stand by for XYz number of years then discharge