Part of the same fleet of ships capable of being converted into aircraft carriers Ryuho underwent the conversion process which lasted from Dec. 1941 to Nov. 1942. During that conversion process, Ryuho was hit by bombs during the Doolittle Raid on Tokyo. After her conversion, Ryuho mainly served as an aircraft ferry or training carrier. Her only combat action was at Philippine Sea where she lost her entire air group to American fighters. She survived the war to be scrapped in its aftermath. Ironically she would have the distinction of being the last carrier to operate outside of Japanese home waters. The general opinion of her was that she was the weakest of the fleet of ships converted into fleet carriers.