The Enforcement Act of Act of Military Service System Article 19

Reserved Military Men shall be administered by the Ministry of National Defense. Other matters related to other agencies are handled by each relevant agency.
中文原文 兵役法施行法第19條
後備軍人之管理由國防部主管,其他有關機關事項,由各關係機關分別辦理之。

English translation for reference only; the Chinese text prevails. Not legal advice.