noun
military discipline
Refers to the order, morale, and disciplined conduct of soldiers. Often used in contexts of maintaining or violating discipline.
軍紀を乱す行為は厳しく罰せられる。
Acts that disrupt military discipline are severely punished.
彼は軍紀違反で処罰された。
He was punished for a breach of military discipline.
noun
military regulations; military rules
Refers to the written rules and regulations governing military conduct. 軍規 is the typical kanji for this sense.
軍規に従って行動しなければならない。
You must act in accordance with military regulations.
新しい軍規が制定された。
New military rules were established.
Compound of 軍 (military) and 規 (rule, standard) or 紀 (order, discipline). The two kanji spellings reflect a nuance between regulations (規) and discipline (紀).