President Trump inherited a mess in Afghanistan, so give him credit for heeding his generals and committing to more troops and a new strategy. His decision has risks, like all uses of military force, but it will prevent a rout of our allies in Kabul and allow more aggressive operations against jihadists who would be delighted to plan global attacks with impunity.
Also give him credit for explaining a matter of war and peace to the American people Monday in a serious, thoughtful speech. Barack Obama unveiled his Afghan strategy in a major speech in 2009 and then tried to forget about the place. Mr. Trump should continue making the case for his strategy in more than Twitter bursts.
The heart of the new strategy is a commitment linked not to any timeline but to “conditions” on the ground and the larger war on terror. “We are not nation-building again. We are killing terrorists,” he said, in a line that will resonate with his political base even if building the Afghan defense forces is part of the goal.
Mr. Obama’s great antiterror mistake was imposing political limits that made it harder to succeed. He did this in Afghanistan at the start of his surge when he put a timeline on withdrawal. And he did it at the end of his term when he refused to let U.S. forces target Taliban soldiers even when they were killing our Afghan allies.
Mr. Trump said he is also lifting “restrictions” from Washington on the rules of military engagement. This means going after jihadists of all stripes, and it gives the generals flexibility to inflict enough pain on the Taliban that they begin to doubt they can win. Mr. Trump didn’t commit to a specific number of troops, though some sources have suggested 4,000 in addition to the 8,400 currently there.
Those troops won’t turn the tide by themselves, but we hope Defense Secretary Jim Mattis has the flexibility to deploy what he needs. If the strategy includes more close-air support, medical evacuation capability, Apache attack helicopters and officers embedded at the battalion level with Afghan military units, the U.S. troops will boost the morale of Afghan forces who ultimately have to win the war.
Mr. Trump’s most significant shift—if he can follow through—is the challenge to Pakistan. “We have been paying Pakistan billions and billions of dollars at the same time they are housing the very terrorists that we are fighting,” he said. “But that will have to change, and that will change immediately.”
History shows that a key to defeating an insurgency is denying the kind of safe haven that Pakistan provides the Taliban and the closely allied Haqqani network. Mr. Trump’s implication is that Pakistan must help in Afghanistan or face a cutoff in U.S. aid and perhaps cross-border strikes against terrorists inside Pakistan. Pakistani military leaders have never taken such a U.S. threat seriously, and if they play the same double game Mr. Trump will have to show he means it.
The Taliban now control as much as 40% of Afghan territory. But if the U.S. and Afghan army can stabilize more of the country, while training more Afghans to be as effective as its special forces have become, a diminished Taliban threat is achievable. The Afghan government will also have to do its part by providing better governance. Taliban leaders will have to be killed, but its foot soldiers might decide over time they can live with the government in Kabul.
And what is the alternative? Senator Rand Paul and the isolationist right want a U.S. withdrawal. But as Mr. Trump explained, that could return Afghanistan to a jihadist playground. Mr. Trump would own the foreign-policy and political consequences as Mr. Obama did the rise of Islamic State after his retreat from Iraq. Opposition from Democrats now is also disingenuous given their silence as Mr. Obama pursued his losing strategy.
Erik Prince of Blackwater has proposed turning the Afghan duty over to mercenaries with experience in the country. But does anyone think the U.S. public would long support paying modern-day Hessians to fight, as the press corps highlights every mistaken use of force or alleged misuse of taxpayer funds? Democrats turned Blackwater into a dirty political word—unfairly, for the most part—even when it was working side by side with U.S. troops in Iraq.
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As Mr. Trump acknowledged, the U.S. public is wary of spending money on war without results. But Americans have also shown they will support commitments abroad for decades as long as casualties are low and they serve U.S. security interests. That’s true in South Korea, Europe and the Persian Gulf. The long war against jihadists will require similar commitments abroad.
Mr. Trump campaigned against overseas entanglements, but America’s foreign commitments can’t be abandoned without damaging consequences. Mr. Trump has now made his own political commitment to Afghanistan, and his job will be maintaining public support and congressional funding. These obligations go with the title of Commander-in-Chief.