Peter Bergen wrote for CNN about why Afghanistan is deeply personal for Trump's generals:
The seriously deteriorating situation in Afghanistan -- and what to do about it -- is a deeply personal issue for Trump's top national security advisers and generals.
In the months after the 9/11 attacks, Trump's secretary of defense, retired Marine four-star General James Mattis, led the deepest assault from a ship in Marine Corps history near the key Taliban city of Kandahar in southern Afghanistan.
Trump's National Security Adviser Lt. General H.R. McMaster served in Afghanistan, leading an anti-corruption task force there in 2010.
Trump's top military adviser, the Chairman of the Joint Chiefs Marine Gen. Joseph F. Dunford, was the commanding general in Afghanistan in 2013.
And General John Kelly, the retired four-star Marine general who is now Trump's chief of staff, lost a son in Afghanistan, 29-year-old Marine 1st Lt. Robert Kelly who was killed by a landmine there in 2010.