Today, I'm a Drill Sergeant/Infantryman in the Army reserve. Tomorrow I'm a lawyer for the government and sometimes law enforcement academy instructor. Previously I have been a police officer and police firearms instructor, as well as a hunter, competitive shooter, civilian and armed security firearms instructor and lots of other things, as far as where my "expertise/knowledge base comes from."
The person who has nothing for which he is willing to fight, nothing … more important than his own personal safety, is a miserable creature [with] no chance of being free unless made and kept so by the exertions of better men …. John Stuart Mill