Wilf, now you are talking about something different. The US Army COHORT program had cadres training recruits and then the whole unit was shipped off to a parent battalion - so that you had a unit that had gone from basic training to (possibly) war as a single entity. They typically stayed together for for three years and, in my limited experience with them, were better units than those that used the normal individual rotation system.

Problem was, the US Army personnel system couldn't handle the change and a very promising system was abandoned. I'm all for depot battalions and regimental systems and unit cohesion, but that type of change is unlikely to arise absent some existential national emergency.

But we could, I believe, fairly easily improve the state of individual entry training - basic skills training - and make it easier for units in the field to integrate individual replacements even in wartime - If we devote more resources to the effort.