(1) In this Part, unless the contrary intention appears:
"forces" , in relation to a country, means the naval, military or air forces of that country.
"service authorities" , in relation to a country, means the naval, military or air force authorities of that country.
(2) A reference in this Part to a country in relation to which a provision of this Part applies shall be read as a reference to a country declared by the regulations to be a country in relation to which that provision applies.
(3) For the purposes of this Part, a member of a force of a country that (by whatever name called) is in the nature of a reserve or auxiliary force shall be deemed to be a member of the forces of that country so long as, but only so long as, he or she is called into actual service (by whatever expression described) with those forces or is called out for training with those forces.