This Sunday the National Park Service will hold a ceremony commemorating the worst homefront disaster of World War II. Just 15 miles east of Vallejo, a segregated black unit was loading live ammunition onto ships bound for the Pacific when 5,000 tons of munitions exploded, killing 320 men. When the survivors refused to continue loading explosives, they were charged with mutiny. Family members and legislators are now urging President Obama to exonerate these soldiers.