During my time, you served in one MOS, when it came time to change duty stations, rotate stateside (or overseas), you could request assignment in a different MOS. Pentagon could also reassign you, if you had an MOS in a critical shortage area.
It was also not unusual to have an MOS that was outdated, an example would be a 19E (M60 Armor Crewman) during the early '80s when the M-1 (19K) was entering service. It was also not unusual to see tankers carrying a Cavalry Scout (19D) or even an Infantry (11B) MOS.
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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