By all means, practice not touching your face before you go. Because God help you if a DI catches you doing that (for that exact reason, they don't want another pinkeye outbreak) (but also because they don't want you moving during drill). If you're looking to actively practice something before shipping out, try just standing at attention for a long time without twitching or scratching or the like, since you'll do quite a bit of that. Also, put on some Gaffigan or Regan or Dane Cook or whoever does it for you, and practice not laughing. Hell, try not laughing at Archer.
"Are they all black, Woodhouse? Or are five of them black and five of them slightly darker black?"