The training concept has become, in my view, a kind of psychological crutch for US elites who don't want to face their own basic inability to improve things. The idea that you could help resolve an ongoing multifaceted conflict by introducing greater quantities of lethal weaponry and better-trained fighters is absurd on its face. At best, we're in the position of arming several sides in a multi-pronged civil war in the vague hope that whoever prevails won't notice we were also arming their adversaries and be loyal to us down the road, which seems like a really, really, really stupid bet.
Years and years of this crap because of the delicate egos of old men. The disaster they have wrought and perpetuated because of their perceived need to "save face." Our elite class is made up of a bunch of self-important children who believe lack of personal accountability for themselves is America's highest ideal.