3. Validation of certain past commands. Every command given, after the 30th day of September, 1946 , and before the commencement of this Act, to any person referred to in sub- section (2) of section 2 by any superior officer in relation to employment upon or in connection with any such service as the Central Government may, by notification in the Official Gazette, specify in this behalf, shall be deemed to have been a lawful command within the meaning and for the purposes of the Acts referred to in that sub- section, so however that no such person shall be punished by reason only of his not having obeyed any such command.