504 is one of the 82nd Airborne Division's Parachute Infantry Regiments (known today as Brigade Combat Teams) and "Dirt Dart" is a military slang term for airborne personnel, or Paratroopers. This is a channel for guns, gear and (hopefully) a bit of fun along the way.
Am I an expert on guns? Far from it - I've barely touched one since leaving the Army in 1999. I think it will come back to me, though. Maybe...