Hmmmm, that's an interesting question.
Unique? As a rule? no. Are there certain traits that military members tend to share? yes.
What exactly are you looking for on this? You've posted in the CFHS forum, so you're looking for medical opinion, but it's a little vague.
They tend to have a higher then normal level of cardiovascular fitness. This does not seem to confer an immunity to cardiovascular disease in the long term.
They tend to have interesting medical histories, with a high number of mild-moderate msk injuries, but are "poor historians" and will gloss over large details. They tend to be free of chronic diseases, they have unique psychological support systems, they have high expectations for their recovery. Many have risk factors associated with PTSD and CIS. They tend to be action-oriented, and are looking for a fix Right Now!
They are probably poorly compliant with medical limitations and physiotherapy instructions, but there are exceptions. Many avoid medications, or don't comply with instructions. Many will not willingly seek treatment. Many with chronic injuries or disorders poorly understand them.
Some are there to avoid difficult and/or dangerous duties. Many will take exception to being labelled "unfit." Some will deny (or invent) the presence of symptoms or minimize their impact to achieve a desired end state.
Anything more specific you're looking for?
DF