Tom Bowman

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The new troops of the Afghan 215th Corps are assembled on a wide plaza at midday at their base, called Camp Shorabak.

Passing in review is their new commander, Maj. Gen. Wali Mohammad Ahmadzai. He proved himself fighting the Taliban in northeast Afghanistan. Now he's in charge of Helmand — the deadliest province in a troubled country.

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Gen. John W. "Mick" Nicholson settles into his wood-paneled office inside the American-led military headquarters in Kabul. It's lined with plaques, pictures and ceremonial swords.

He has spent more time in Afghanistan, in various jobs, than any other senior American officer — a total of 5 1/2 years. The commander of NATO's Resolute Support mission and U.S. forces in Afghanistan since March 2016, Nicholson is a genial West Point graduate with salt-and-pepper hair — and a renewed confidence.

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So when it comes to the White House banning transgender people serving in the U.S. military, a key word they are using is deployability.

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