John Phillip Walker Lindh (born February 9, 1981) is an American citizen who was captured as an enemy combatant during the United States' 2001 invasion of Afghanistan. He is now serving a 20-year prison sentence in connection with his participation in Afghanistan's Taliban army. He was captured during the Battle of Qala-i-Jangi, a violent Taliban prison uprising during which Central Intelligence Agency officer Johnny "Mike" Spann was killed.
Lindh received training at Al-Farouq, a training camp in Afghanistan associated with Al-Qaeda. There, he attended a lecture by Osama bin Laden before the September 11, 2001 attacks, though he was not aware of the planned attacks and is said to have found him "unimpressive." Lindh had previously received training with Harkat-ul-Mujahideen, an internationally designated terrorist organization based in Pakistan.
Lindh went by the name Sulayman al-Faris during his time in Afghanistan, but prefers the name Abu Sulayman al-Irlandi today. In early reports following his capture, he was usually referred to by the news media as just "John Walker".