Article 7(b), of the UCMJ - a person must have commited a crime or look like they will commit a crime. It can be convoluted thanks to "probable cause" and objective reasonableness).
It depends on who "you" is. Article 7 gives apprehension authority to military and naval law enforcement officials. Article 8 authorizes state/local police officers to apprehend deserters, only.
The US Constitution specifies that the President is the commander-in-chief of US military forces.
In a democracy authority comes from the people.
The Parliament does
The Constitution grants Congress the power to make rules for governing the armed forces. This authority is outlined in Article I, Section 8, which specifies that Congress has the power to raise and support armies, provide and maintain a navy, and make rules for their governance. Additionally, the President serves as the Commander-in-Chief of the armed forces, but the legislative authority rests with Congress.
Adjudication means to give power, right, or authority.
Rights
What government gives the supreme authority to the states
What government gives the supreme authority to the states
What government gives the supreme authority to the states
What government gives the supreme authority to the states
The King