Class 4.-Those who were born in the years 1876 to 1882, both inclusive, and are married, or are widowers who have a child or children. Class 5.-Those who were born in the years 1872 to 1875, both inclusive, and are unmarried, or are widowers who have no child. Class 6.-Those who were born in the years 1872 to 1875, both inclusive, and are married, or are widowers who have a child or children. (2) For the purposes of this section, any man married after the sixth day of July, 1917, shall be deemed to be unmarried. (3) Any class, except Class 1, shall include men who are transferred thereto from another class as hereinafter provided, and men who have come within Class 1 since the previous class was called out. (4) The order in which the classes are described in this section shall be the order in which they may be called out on active service, provided that Governor in Council may divide any class into subclasses, in which case the subclasses shall be called out in order of age beginning with the youngest. 4. (1) The Governor in Council may from time to time by proclamation call out on active service as aforesaid for the defence of Canada, either in Canada or beyond Canada, any class or subclass of men described in section three, and all men within the class or subclass so called out shall, from the date of such proclamation, be deemed to be soldiers enlisted in the Military Forces of Canada and subject to military law for the duration of the present war, and of demobilization thereafter, save as hereinafter provided. (2) Men so called out shall report, and shall be placed on active service in the Canadian Expeditionary Force as may be set out in such proclamation or in regulations, but until so placed on active service, shall be deemed to be on leave of absence without pay. (3) Any man by or in respect of whom an application for exemption is made as hereinafter provided, shall, so long as such application or any appeal in connection therewith is pending and during the currency of any exemption granted him, be deemed to be on leave of absence without pay. (4) Any man who is called out and who, without reasonable excuse, fails to report as aforesaid, shall be guilty of an offence, and shall be liable on summary conviction to imprisonment for any term not exceeding five years, with hard labour. 5. (1) There shall be established in the manner hereinafter set out, the following tribunals:- (a) Local Tribunals; (b) Appeal Tribunals; (c) A Central Appeal Judge.