I'm personally a big fan of steel frames and the smooth ride they offer. If you're considering a steel touring bike (light duty or otherwise), you might want have a look at the Jamis Aurora, Surly Long Haul Trucker or Surly Cross-Check.

(On a side note: my thanks and appreciation go out to you for the job you do to keep our country safe. Best Wishes for a safe tour of duty and return home.)