Refers collectively to the military, government officials, and military police or authorities, often in contexts of martial law or military control.
戒厳令下では軍官憲が治安を維持する。
Under martial law, the military authorities maintain public order.
Compound of 軍 (military), 官 (government officials), and 憲 (constitution/law, here referring to military police). The exact historical derivation is uncertain; the term is conventionally associated with military and police authorities.