The Enforcement Act of Act of Military Service System Article 3-1

The male who volunteer to go through the conscription procedure, have passed the conscription examination and taken the Military Training of Standing Soldier Service prescribed in Paragraph2 of Article 32, will be inducted to serve in the military camp according to the order of their ages and the sequence of numbers drawn.
中文原文 兵役法施行法第3-1條
男子志願依兵役法第三十二條第二項規定,提前受徵兵處理並經徵兵檢查合格,入營受常備兵役軍事訓練者,按其出生年次先後及抽籤號次徵集入營。

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