During World War II the cruise ship Queen Mary was used by the allies as a troop transport ship.
Her hull, superstructure and funnels were painted navy grey. As a result of her new color and in combination with her great speed, she became known as the “Grey Ghost”. To protect against magnetic mines, a degaussing coil was fitted around the outside of the hull. Inside, stateroom furniture and decoration were removed and replaced with triple-tiered wooden bunks (which were later replaced by standee bunks).
Six miles of carpet, 220 cases of china, crystal and silver service, tapestries and paintings were removed and stored in warehouses for the duration of the war. The woodwork in the staterooms, the first-class dining room and other public areas was covered with leather.
After her retirement in 1967, she steamed to Long Beach, California, where she is permanently moored as a tourist attraction, hotel, museum, and event facility.
Source: National Archives