Section 121: Power to arrest offenders

(1) A person subject to service law under this Act found committing an offence under any provision of this Act, or alleged to have committed or reasonably suspected of having committed the offence, may be arrested in accordance with the following provisions of this section.
(2) A person authorised to effect arrest under this Part of this Act may use such force as is reasonably necessary for that purpose.
(3) An officer may be arrested by an officer subject to service law under this Act of superior rank, or, if engaged in a quarrel or disorder, by an officer of any rank.
(4) A soldier, rating or an aircraftman may be arrested by an officer, warrant or petty officer or a non-commissioned officer subject to service law under this Act, provided that, a person shall not be arrested by virtue of this subsection except by a person of superior rank.
(5) A provost or any officer, warrant or petty officer, non-commissioned officer, or soldier, rating or aircraftman subject to service law under this Act who is lawfully exercising authority under a provost officer or on his behalf, may arrest any officer or soldier, rating or aircraftman, provided that, an officer shall not be arrested by virtue of this subsection except on the order of another officer.
(6) The power of arrest vested in a person by this section may be exercised either personally or by ordering into arrest the person to be arrested or by giving orders for that person's arrest.