association of reservists; reservists' association
Refers to an organization for military reservists, often used in historical contexts such as pre-war Japan.
Before the war, the reservists' association had great influence in local communities.
Compound of 在郷 (ざいごう, 'in one's hometown') + 軍人 (ぐんじん, 'military personnel') + 会 (かい, 'association').