In his four years stationed at Miramar Marine Corps Air Station in San Diego, former Cpl. Joe Potter had never met Cpl. Jason Dunham. Potter joined the Marine Corps the year that Dunham died. But  Dunham’s legacy as a combat warrior and Medal of Honor recipient who gave his life to save his fellow Marines from an insurgent’s grenade in Iraq in April 2004 had been well ingrained in Potter’s memory during the four years he  spent working as an expeditionary airfield specialist with Headquarters and Headquarters Squadron. Since hanging up his uniform, Potter has worked in his father’s painting business,…