When I got to Marine Corp Platoon Leadership Course – I was the oldest in the troop, at 28; and they made me feel it everyday – physically, mentally, and emotionally. It was a draining experience, and again – another transformation. The Marine Corps runs this Virginia training course around the acronym JJDIDTIEBUCKLE - the 12 core concepts of effective Leadership. Judgment Justice Dependability Integrity Decisiveness Tact Initiative Endurance Bearing Unselfishness Courage Knowledge Loyalty Enthusiasm. To graduate successfully, you must not only memorize the acronym, but it must be in the very fabric of everything you do in service to the Corps and your Company.