. ▁While ▁at ▁the ▁camp , ▁he ▁attended ▁a ▁lecture ▁by ▁Os ama ▁bin ▁L aden . ▁After ▁the ▁ 9 / 1 1 ▁attacks , ▁he ▁remained ▁there ▁to ▁join ▁oppos ing ▁military ▁forces ▁after ▁he ▁learned ▁that ▁the ▁U . S . ▁was ▁al lied ▁with ▁the ▁Afghan ▁Northern ▁Alliance . ▁Lind h ▁had ▁previously ▁received ▁training ▁with ▁H ark at - ul - M uj ah ide en , ▁an ▁intern ation ally ▁designated ▁terror ist ▁organization ▁based ▁in ▁Pakistan . ▁ ▁Lind h ▁went ▁by ▁the ▁name ▁Sul ay man ▁al - F aris ▁during ▁his ▁time ▁in ▁Afghan istan , ▁but ▁pre fers ▁the ▁name ▁Ab u ▁Sul ay man ▁al - I r land i ▁today . ▁In ▁early ▁reports ▁following ▁his ▁capture , ▁when ▁the ▁press ▁learned ▁that ▁he ▁was ▁a ▁U . S . ▁citiz en , ▁he ▁was ▁usually ▁referred ▁to ▁by ▁the ▁news ▁media ▁as ▁just ▁" John ▁Walker ". ▁ ▁Youth , ▁conversion , ▁and ▁travel s ▁Lind h ▁was ▁born ▁in ▁Washington , ▁D . C ., ▁to ▁Mar il yn ▁Walker ▁and ▁Frank ▁R . ▁Lind h , ▁as ▁the ▁middle ▁of ▁three ▁children ▁in ▁the ▁family . ▁He ▁was ▁named ▁" John " ▁after ▁John ▁L enn on , ▁who ▁was ▁murder ed ▁two ▁months ▁before ▁Lind h ' s ▁birth . ▁He ▁was ▁bapt ized ▁a ▁Catholic , ▁and ▁grew ▁up ▁in ▁Silver ▁Spring , ▁Maryland . ▁When ▁he ▁was ▁ 1 0 ▁years ▁old , ▁his ▁family