Also, a reserve force may be wholly adequate, depending upon the security situation. Consider the American experience with Minutemen and not having a standing Army.
Soldiers know when they are being given busy work and it is a morale killer. If there is a concern about idle Soldiers, then I think the leadership should begin by asking, "what is it we're afraid the men are going to do if they are too idle?" Then choose an appropriate course of action from there. I suspect there will be many alternatives less costly or complicated than major training exercises. Exercises are also not necessarily something that keeps the Soldiers occupied as one would expect (and I'm only speaking from the experience of seeing some jaw-dropping idiocy occur during US Army training exercises).
If you are just standing up an Army, I would think you could tend toward quantity in the short term, just to ensure enough young, able-bodied men have employment. Once the situation stabilizes, then you can focus more on quality.
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