The Enforcement Act of Act of Military Service System Article 11

Standing Soldiers extend service during the period of Active Service in accordance with Articles 19 of the Act of Military Service System may be disposed of in the following manners:Subparagraph 1-Extension of service in accordance with Subparagraph 1 of Articles 19 of the Act of Military Service System shall be conducted according to the order of the Ministry of National Defense. The period of the extension shall not be longer than one year except for the volunteers. When necessary, the stipulated period may be extended for 1 more year, and then retired. Subparagraph 2-Extension of service in accordance with Subparagraph 2 to Subparagraph 4 of Articles 19 of the Act of Military Service System shall not be longer than one year and shall be conducted according to the order of the affiliated troop and submit a report to the Ministry of National Defense for file. The Soldiers shall retire upon the cause of extension disappeared. The period of extension under the preceding paragraph shall be deducted from the period of military service afterwards.
中文原文 兵役法施行法第11條
常備兵服現役期間,依兵役法第十九條規定延役者,按下列規定處理:
一、依兵役法第十九條第一款延役時,應依國防部命令行之,除志願留營者外,其延役期間,以一年為限,必要時,得再延長一年,期滿退伍。
二、依兵役法第十九條第二款至第四款延役時,以一年為限,由所屬部隊以命令行之,並陳報國防部備查,於延役原因消滅時,即行退伍。
前項延役時間,應於爾後應召入營服役之時間內扣除之。

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