Everyone would enlist for three or four years in the combat arms and after one hitch could reenlist for a CS/CSS job. Probationary hitch there and then they could reenlist for a career where ever they wished if there was a space. PCS's in CONUS would be cut by 2/3 saving big bucks. Homesteading would be tolerated. No 'up or out' but a definite out for non-performance. Most Training, MAAGs and ROTC Dets would use a Junior ROTC-like contract for Retired folks (language required for the MAAG jobs, all other Active duty standard met including height and weight) on five year contracts, renewable one time, periodic re-greening required.
Congress would never buy it -- neither would most of the Generals.
To realistically answer your question, some do join to learn a skill or trade. Most of the farm kids and suburban dwellers opt for the combat arms for fun and frolic and many plan on one tour and out. A few do go for the technical stuff but the majority who enlist for that do it to get a later leg up in civilian life. The reenlistment rates in those skills vary from time to time and MOS to MOS but are rarely as good as the Army would like -- those skills are in some cases, very expensively acquired. I don't think requiring some combat arms time of everyone is going too far (even though I know it would impact recruiting a bit) but I think most might disagree with me.
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