 Some practitioners of traditional Japanese martial arts have noted that aiki-jō techniques bear more resemblance to jukendo (bayonet fighting, which Ueshiba studied during the Russo-Japanese War) than to classical Japanese spear Sōjutsu and staff Bōjutsu systems.Note that the practice of Aiki-jō is not universal.Some schools of aikido incorporate weapons training that is unrelated to aiki-jō, and others cast aside weapons training entirely.