the military they committed to serve. the pentagon s battle to do something about it. revealing investigations, fascinating characters, stories with impact. this is cnn presents with tonight s host, drew griffin. tonight, a special look at some of the men and women who have served our country. opening investigations into the unbelievable injustices done to them. we begin with the startling story how u.s. soldierings were used as human guinea pigs. during the cold war the military embarked on a top secret program to test chemical and biologic weapons. the researchers used animals. believe it north, they also used humans, volunteers from the army who had no idea what they were signing up for. nearly half a century later, some of these human guinea pigs are emerging from the shadows with disturbing stories what the military did to them then and how they re being treated now. dr. sanjay gupta investigates. i enlisted. joined at 18 years of age. it was the height of the vi