[The Association of Retired Military and Naval Officers]
Founded in 1877, Kaikōsha is composed of retired generals, warrant officers, officer cadets, and high-ranking civil servants of the Imperial Japanese Army and former commissioned officers of the Japan Ground/Air Self-Defense Forces.
This organization publishes a monthly magazine, “Kaikō (偕行),” which contains articles about security and military history by members; some articles are related to constitutional revision, mainly focusing on Article 9. In these articles, members generally call for revision of Article 9. The magazine’s articles can be found here. Their website also offers essays by the members here.