Parents Of Soldier Say They Warned Army About Thrill Kill Sergeant

Sept. 28, 2010— -- The allegations are reminiscent of the military's darkest days in Vietnam.

Again, young GI's caught up in a difficult war are accused of widespread drug use and the random killing of innocent civilians, apparently for sport or thrills.

But the parents of one of the five soldiers charged with the premeditated murder of unarmed Afghans say that before one of the murders they tried to warn the Army and a U.S. Senator – and no one helped.

Now their son, 20-year-old specialist Adam Winfield, is charged with taking part in a killing three months after the Winfield family tried to blow the whistle.

The soldiers were serving at Forward Operating Base Ramrod in southern Afghanistan. On a videotaped confession obtained by ABC News, one of the soldiers, Corporal Jeremy Morlock, described how his Sergeant, Calvin Gibbs, had the men in his unit pick out civilians at random and then kill them with grenades and rifle fire.

"Gibbs called it like, 'Hey you guys wanna, you guys wanna wax this guy or what?' And you know, he set it up, like, he grabbed the dude."

Morlock told how Gibbs allegedly threw a grenade at the civilian, and then told Morlock and the others, 'Wax this guy. You know, kill this guy, kill this guy.' "

Morlock said that killing people came "too easy" to Gibbs. ""He just really doesn't have any problems with f___ing killing these, these people, to be honest."

Morlock also told investigators he believed that Gibbs was crazy and wouldn't hesitate to silence witnesses.

"If Gibbs knew that I was sitting in front of this camera right now," said Morlock, "there's no doubt in my mind that he'd f------ take me out if he had to."

CLICK HERE TO WATCH THE INTERVIEW WITH MORLOCK