Karl Eikenberry, a William J. Perry Fellow in International Security at CISAC, former U.S. ambassador to Afghanistan and Lt. General in the U.S. Army (Ret.) speaks with National Georgraphic Channel in its new series: American War Generals. The two-hour show which aired on Sept. 19, 2014, reveals never-heard-before stories and insightful opinions from 11 active and retired U.S. Army generals, according to the NatGeo website. Their accounts take the viewers through the big changes that have transformed the U.S. military from the first troops to enter Vietnam to the last combat troops to exit Afghanistan, explaining the critical personal experiences that shaped their lives and the way they approached modern warfare.

You can watch Eikenberry's account and the other general's here.