souvenirs. on a tape obtained by abc news, corporal jeremy morelock, also charged with murder, told army investigators sergeant gibbs was crazy, that no one could tell him no. you don t want to cross paths with gibbs at all. when it comes to killing people, it s too easy for that guy. reporter: it is shades of vietnam, including allegations that soldiers at the base regularly use drugs, hashish laced with opium, to deal with the stress of their lives in afghanistan. bad days, stressful days, days that we just need an escape. reporter: the military now confirms it is investigating the allegations that the parents of adam winfield tried back in february to warn the army, that both innocent afghan civilians and u.s. soldiers were being put at risk. brian ross, abc news, new york. the fallout from the merger of southwest and airtran airways could impact travel in most of the nation. southwest is buying airtran for nearly $1.5 billion. the deal opens the way for southwest to move