actions during the attack on Pearl Harbor. Miller had voluntarily manned an anti-aircraft gun and fired at the Japanese aircraft, despite having no prior training in the weapon's use. On April 14, 1943, Joseph C. Jenkins became the first African-American commissioned officer in the United States Coast Guard. He was joined first by Clarence Samuels on August 31, 1943, and then by Harvey C. Russell Jr. in February 1944. In March 1944, the Golden Thirteen became the Navy's first African-American commissioned officers. Samuel L. Gravely, Jr. became a commissioned officer the same year; he would later be the first African American to command a US warship, and the first to be an admiral. The Port Chicago disaster on July 17, 1944, was an explosion of about 2,000 tons of ammunition as it was being loaded onto ships by black Navy sailors under pressure from their white officers to hurry. The explosion in Northern California killed 320 military and civilian workers, most of them black. It led a month later to the Port Chicago Mutiny, the only case of a full military trial for mutiny in the history of the U.S. Navy against 50 African-American sailors who refused to continue loading ammunition under the same dangerous conditions. The trial was observed by the then young lawyer Thurgood Marshall and ended in conviction of all of the defendants. The trial was immediately and later criticized for not abiding by the applicable laws on mutiny, and it became influential in the discussion of desegregation. During World War II, African-American soldiers served in all fields of service. In the midst of the Battle of the Bulge in December 1944, General Eisenhower was severely short of replacement troops for existing all-white companies. Consequently, he made the decision to allow 2000 black servicemen volunteers to serve in segregated platoons under the command of white lieutenants to replenish these companies. These platoons would serve with distinction and, according to an Army survey in the summer of 1945, 84% were ranked "very well" and 16% were ranked "fairly well". No black platoon received a ranking of "poor" by those white officers or white soldiers that fought with them. These platoons were often subject to racist treatment by white military units in occupied Germany and were quickly sent back to their old segregated units after the end of hostilities in Germany. Despite their protests, these brave African-American soldiers ended