The psychological toll of war on US soldiers is depicted in grainy black-and-white footage, a young American soldier from World War II struggles to express his feelings in a wrenching scene from a new documentary.
"I can't stand seeing people killed," the soldier eventually manages to say, averting his eyes.
Despite the film's unflinching take on combat stress, top military brass hosted the premiere of "Wartorn: 1861-2010" Thursday at the Pentagon, illustrating a shift in commanders' attitudes to a problem once dismissed as a sign of weakness.
The unusual venue and audience, which included the country's highest ranking officer, Admiral Mike Mullen, as well as families of troubled soldiers depicted in the film, underscored how military leaders are now ready to confront the "invisible wounds" of the wars in Iraq and Afghanistan.
"What's interesting is the way in which the military is embracing this, and that they're choosing to show this at the Pentagon," said Jon Alpert, the director and producer.
"They're choosing to talk about this openly, really for the first time," he told AFP.
The documentary recounts how senior officers in another era had little patience for what was called "battle fatigue" in World War II.
In that conflict, General George Patton slapped a soldier hospitalized with "nervous exhaustion."
"I won't have the hospitals cluttered up with these sons of bitches who haven't got the guts to fight," Patton said.