Somewhere, a small group of soldiers is formed in a loose circle, attention fixed on a noncommissioned officer at the center, delivering sharp, no-nonsense instructions. Their voice carries authority, punctuated by rhythmic spit of smokeless tobacco into a bottle. Dip and other tobacco use has been a tradition in the military for generations -- and more recently a health concern. Times may be changing, though, and those dip bottles that are a symbol of authority and Army life could be on the