Section 52
SEC. 52. The obligation to undergo military training shall begin with youth in school, commencing at the age of ten years and shall extend through his schooling until he shall reach the age of eighteen years. At this age he shall enter the Junior Reserve to which he shall be assigned until he is twenty-one years of age when he shall become subject to service with the colors, and thereafter with the Reserve Force until he shall reach fifty years of age. The training, which he may undergo prior to the calendar year in which he attains twenty-one years of age shall be termed “Preparatory Military Training." All school girls shall receive such instruction and training as the Chief of Staff may deem necessary for auxiliary service. All able-bodied male citizens between the ages of twenty years and fifty years, both inclusive, except those specifically exempted, shall be classified as follows: Trainees—Those between the ages of twenty and twenty-two who have been selected to receive military training. First Reserve—Those between the ages of twenty-two; years arid thirty years, both inclusive, and including also: all those who have completed trainee instruction even though' they may not have attained the age of twenty-two. Second Reserve—Those between the ages of thirty-one: years and forty years, both inclusive. Third Reserve—Those between the ages of forty-one, years and fifty years, both inclusive.