"The helicopters were approximately a mile and a half away and they were zooming in on these guys," McCord recalls to RT's Meghan Lopez. "And looking at it now you obviously can't see anything."
The whistleblower website released the video on April 5, 2010, and instantly made international headlines by exposing what the War in Iraq really meant to some. The clip in question, taken from camera affixed to an Apache helicopter flown by US troops, showed Americans opening fire on civilians and journalists.
"That right there is obviously a camera dangling if you really pay attention," McCord says of one person caught on film. "That guy has an AK-47 right there," of another.
McCord was patrolling a volatile part of Baghdad on July 12, 2007 with the 216th Battalion when his colleagues started shooting. "I was about five blocks away, four or five blocks away to the left of the screen... this was a battalion wide mission," he recalls.
"One guy's head was off, the top of his head was completely off and his brains were on the ground and the smell, the smell still haunts me every day. I don't know how to describe it," he says.
Then when McCord approached a van targeted by the airstrike, he heard a noise he wasn't expecting: the cry of a little girl.
"I think she was four years old and you could tell she had a wound to the stomach and I remember her looking at me and the blood around her eyes made her eyes so ghostly," he says.
McCord grabbed the girl and ran her into a nearby building. There he picked the glass out of her eyes so she could blink and handed her off to a medic.
"I went back outside and we were told to take pictures and so I started taking pictures of the van," he says.
Then he discovered another child.
"That's me right there," McCord tells Lopez as he walks her through the now infamous "Collateral Murder" clip. "That is a little boy that I originally thought was dead."
Despite their injuries, the children survived. Part of Ethan McCord, though, changed forever.
"I couldn't stop myself from crying," he says.
McCord sought out mental health afterward, and says he was mocked by his commanders and threatened with expulsion from the military.
"And that's when I started drinking," he says. "And the mental health [doctor] had given me prescriptions: 13 prescriptions."
Things got worse, though, and McCord began imagining the worse. Routine daydreams turned to fantasies about killing own children and everyone around him. In response, he tried to end his life.
"I had already begun drinking pretty heavily and I downed all of the pills and I drank a fifth of Crown Royal at 10 o'clock in the morning and my wife at the time found me and called the ambulance," he says.
After trying to take his own life, McCord was dismissed from the military. "Kicked out with no disability, no benefits from the Army whatsoever," he says.
Then McCord moved to Wichita, Kansas and attempted suicide again.
"I actually wrote a poem right before I did it. Right before I put the gun in my mouth," he says.
"I don't know if I really want to talk about it. It was really bad."
"I know that I will never, ever, ever get better," he says. "I will never get over this."
For the world, the "Collateral Murder" video was another black mark on an unpopular war. For Ethan McCord, though, it was a catalyst that made him question the entire purpose of the war.
"You know America, we were John Wayne, we were wearing the white hat. Americans were always trying to help people, that's what we do, we try to spread freedom and democracy," he says. "With the barrel of a gun."
History will be the ultimate determinant for how the Iraq War is viewed, but for Ethan McCord and so many soldiers suffering from post-war stress, the future is far and the past is too much to cope with.
"It does concern me that many more will be returning from Iraq and Afghanistan, I will be Happy they are home as their families will be Happy as well... My Biggest concern is: Will our government look after these soldiers suffering from PTSD, so far they have not done much for our Veterans, I am adding a story from another I posted a week or two ago that a fellow poster gave me the link to, it is my Hope that our Elected Officials will do more to assist our returning Veterans!!!"