147.—Every person subject to military law—

(a) who resists or wilfully obstructs an officer or man in carrying out any duty, performed by such officer or man with due authority, pertaining to the arrest, custody or confinement of a person subject to military law, or

(b) who, when called upon, refuses or neglects to assist an officer or man in the performance of any such duty,

is guilty of an offence against military law and shall, F130[where a charge under this section is disposed of summarily under section 177C, 178C or 179C, as the case may be, be liable to suffer any punishment awardable thereunder or,] on conviction by court-martial, be liable to suffer imprisonment F131[for any term not exceeding two years] or any less punishment awardable by a court-martial.