2The definitions of " Commonwealth forces " in section 225(1) of the [1955 c. 18.] Army Act 1955 and section 223(1) of the [1955 c. 19.] Air Force Act 1955, and the definition of " Commonwealth country " in section 135(1) of the [1957 c. 53.] Naval Discipline Act 1957 shall each have effect with the addition at the end, of the words " or Singapore ".