ZARI, Afghanistan — Because of the poppies, the raw material for most of the world’s heroin, the list of things 1st Lt. Christopher Gackstatter and his 2nd Platoon can’t do in Sartok is far longer than the list of things they can. Marching into the mud-walled village in t­­his sun-baked district of southern Afghanistan on an April 24 intelligence-gathering mission, the boyish 25-year-old lieutenant and his roughly dozen riflemen and […]