What does it mean to kill in combat? How are troops changed by that experience? And what makes some dedicated warriors refuse to do it anymore?
"Soldiers of Conscience," the latest episode in the award-winning PBS documentary series "P.O.V.," grapples with those questions, stripping away politics to bore down to the fundamental function of combat — one human being taking the life of another.
Filmmakers Gary Weimberg and Catherine Ryan explore that subject through the eyes and voices of seven soldiers, all Iraq war veterans.