knuckle dragger

What is knuckle dragger?

knuckle dragger meaning in Military or Military Slang terminology / glossary / dictionary is:
(U.S. Navy Submarine Service) A Machinist’s Mate Auxiliary-man, responsible for non-propulsion systems like the sanitary system or hydraulic system. The term was coined from the stereotype that Machinist Mates are not as intelligent as other rates like Radiomen or Sonar Technicians, so they rely mostly on brute strength to get their job done.(U.S. Air Force) A crew chief, also referred to as “wrench-turner” or “grease monkey”.

 

reference: Glossary of military slang