military discipline
Refers to the order, morale, and disciplined conduct of soldiers. Often used in contexts of maintaining or violating discipline.
Acts that disrupt military discipline are severely punished.
military regulations; military rules
Refers to the written rules and regulations governing military conduct. 軍規 is the typical kanji for this sense.
You must act in accordance with military regulations.
彼は軍紀違反で処罰された。
He was punished for a breach of military discipline.
New military rules were established.
Standard kanji form for military regulations and rules.
Especially used for military discipline; this form is preferred for sense 1.
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).