dudstar, Changing specialty is actually common in the national guard. I am guessing from the information provided that your cousin is switching units. In most cases a reserve/NG trooper would go through his 2 week course and be assigned to his new unit. He would then have to be trained in his individual skill tasks during weekend drills. The majority of the soldiers in the unit would have completed there normal individual training after basic. The soldier who is cross training would in a normal unit be paired with someone experienced if called to active duty, or most likely the whole unit would be required to meet both individual and unit minimums. Also many prison guards and even some small police forces put people on duty after being hired and don't send them to school until the next class would start. By keeping them paired with someone experienced or giving them non essential duties.
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Robert