a reservist who fulfills the military obligation on weekends
週末に軍の義務を果たす予備兵 - 日本語WordNet
In September 1897, he had experience of serving as member of the final examination committee for probationary reservist; and on October 25 of the same year, he was transferred to the 46th Infantry Regiment of Omura (in Nagasaki Prefecture).
明治30年9月には予備役見習士官終末試験委員を経験し、同10月25日大村の歩兵第46連隊附を命ぜられる。 - Wikipedia日英京都関連文書対訳コーパス