It's way too early in the morning to be this alert. What did you put in your coffee?
My thought was that he'd put an adult beverage in his canteen and now couldn't find said canteen because he'd already drank it dry. Doesn't he look a little hungover to you?
PS: The glasses don't look quite right to me. Tinted or Transitions lenses? But I could be wrong because I'm not fully awake.