< Do you know anything about nerve gas and how it is used? Or how it enters the body?

Civilians call it sarin, you'd know it by the name GB. The mission was named Operation Tailwind. In September, 1970, a SOG team was assigned to wipe out a Laotian village suspected of harboring American defectors.

The SOG team was Based in Kontum, South Vietnam. During its preraid briefing at Kontum, the SOG team was told to kill anyone it encountered. Only a few of the SOG's co's knew the target and very few knew the exact type of gas. The unit leaders gave everyone M-17's before the raid.

Several days before the operation began, a small reconnaissance force was dropped into a valley near the Chavan. Sixteen SOG team members went to Dak To, near the border with Laos. The assault force included 12 Cobra's and two backup Marine choppers. As soon as the helicopters approached the landing zone near Chavan, they came under heavy fire. The SOG team hit the ground several miles from the targeted base camp and spent the next three days fighting its way toward it. The village raid lasted no more than 10 minutes. The body count upwards of 100. With the camp destroyed, spotter planes ordered the SOG unit to the rice paddy where the rescue helicopters would land. As the enemy closed in, the SOG team were told to don their M-17's. Then came the gas.

GB was employed in more than 20 missions to rescue downed pilots in Laos and North Vietnam. As for the defectors and the policy of killing them, Major General John Singlaub, U.S.A. (ret.), a former SOG commander, confirms what was the unwritten SOG doctrine in effect at the time: "It may be more important to your survival to kill the defector than to kill the Vietnamese or Russian." The defectors' knowledge of U.S. communications and tactics "can be damaging," he explains. "There were more defectors than people realize," says a SOG veteran at Fort Bragg. No definitive number of Americans who went over to the enemy is available, but Moorer indicated there were scores. Another SOG veteran put the number at close to 300.

Want more proof:

http://www.time.com/time/magazine/1998/dom/980615/world_did_the_us_drop.html