Armed Forces Uniforms Act Article 5

Wearing Field Service Uniforms on the following occasions:Subparagraph 1fighting;Subparagraph 2manoeuvres or trainings;Subparagraph 3operating inside or outside the camp;Subparagraph 4ordinary working days or outing.
中文原文 陸海空軍服制條例第5條
現役軍人穿著野戰服之時機如下:
一、戰鬥。
二、各種演習或訓練。
三、營內、外操作。
四、平時辦公或外出。

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