So far, not all of the Winter Soldier videos have been posted on their website (see here), but one in particular has relevance to the war in Afghanistan:
James Gilligan testimony (video)
Gilligan describes a patrol he was on in Afghanistan in 2004 which came under insurgent fire. He called in erroneous coordinates for a defensive air strike, resulting in repeated air strikes on a village.
Gilligan also recounts an incident, again in 2004, when he witnessed a Huey gunship open fire on fleeing, unarmed Afghans who had been slated for arrest.