Yes, I think you're right. By the time I was a senior lieutenant, junior captain, in my mid-twenties I had probably internalized a lot of what the Army teaches. At that point I was looking to fill in what I felt were specific gaps; detailed things about managing time and information in a knowledge / office work environment (whereas most Army training focuses on the tactical, combat environment), effectively delegating and coaching and giving feedback to subordinates, running a staff meeting, etc. I found specific and helpful tips for that stuff in the business management / consulting literature.