No question that having spent some time as an enlisted man will bring with it some knowledge of some aspects of some things military. On occasion, though, one runs across a Vet who holds forth on all aspects of military affairs past present and future, including strategy history logistics etc as if in possession of degrees from Sandhurst, Dartmouth, a stint at Andover and as a Regimental Sergeant Major; plus time spent as a member of the Parliamentary Defence Select Committee.
Not that there's anything wrong with that.