Regulations for the Organization Procedure, Training Program, Drill and Service of the Voluntary Fire Fighters Article 7

Recruited volunteer firefighters, excluding consultants, branch officers, assistant officers, squad leaders, deputy squad leaders, and officers, shall be employed for a period of three years. Those with good grades may be re-appointed twice at most. However, if recruited volunteer firefighters are foreigners (including residents from China, Hong Kong, or Macau), their period of employment shall be limited to their legal residence in Taiwan.Shall volunteer firefighters in the preceding Paragraph be absent for some reason during their employment period, the successor shall be employed to make up their employment period. Successors with more than two years employment shall be counted as a single appointment.
中文原文 義勇消防組織編組訓練演習服勤辦法第7條
經聘任之義勇消防人員,除顧問、分隊之幹事、助理幹事、小隊長、副小隊長及隊員外,其聘期為三年,成績優良者得予續聘,並以二次為限。
但聘任之義勇消防人員為外國人、大陸地區人民、香港或澳門居民者,其聘期以在臺合法居留為限。
前項義勇消防人員於聘期中因故出缺,繼任人員以補足其聘期為限。
繼任人員聘期逾二年者,以聘任一次計之。

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