Coalitions hold together when members share a mutually reviled Public Enemy #1. In Afghanistan, ours, I guess, is the Taliban—although, as I have written, the Taliban per se pose no security threat to the United States that can’t be eliminated as needed by implementing what MG Paul Vallely (USA ret.) describes as the “lily pad strategy” (which can also take care of Pakistani nukes, he says). The general’s point is, defending American interests wherever threats develop requires no troop presence in Afghanistan.
Tragically, however, we have one and it is getting much bigger.