If you talk a young man into skipping his enlistment when the time is right for him, then he is almost always lost forever to military service, and that is his loss.
I believe Glenn’s nephew was considering re-enlistment.
I don’t think Glenn was in any way critical of the military. He was voicing concerns that many of us have about our current leadership and it’s commitment to win the war. It’s a valid point and he answered his nephew from his heart.