Maybe it's the stress of the job.
Mark Baker is the author/illustrator of Pvt. Murphy. Baker began drawing his award winning cartoon in the early 90s while he was stationed at Fort Bragg, NC. A former 19D Cavalry Scout and then 98C Signals Intelligence Analyst, Baker retired from the Army in 2007. A (growing) collection of his cartoons can be found on his website – pvtmurphy.net or on the Private Murphy Facebook page.