The U.S. Navy has exonerated 256 Black sailors who were found to be unjustly punished in 1944 following a horrific port explosion that killed hundreds of service members and exposed racist double standards among the then-segregated ranks.

Before the explosion, the Black sailors working the dock had expressed concerns about the loading operations. Shortly after the blast, they were ordered to return to loading ships even though no changes had been made to improve their safety.

The sailors refused, saying they needed training on how to more safely handle the bombs before they returned.

What followed affected the rest of their lives, including punishments that kept them from receiving honorable discharges even as the vast majority returned to work at the pier under immense pressure and served throughout the war. Fifty sailors who held fast to their demands for safety and training were tried as a group on charges of conspiracy to commit mutiny and were convicted and sent to prison.