Persons who were engaged in the military or naval service of the United States during the years 1898, 1899, 1900, 1901, 1902, 1914, 1915, 1916, 1917, 1918, 1919, any time between September 16, 1940 and July 25, 1947, or any time during the national emergency between June 25, 1950 and January 31, 1955, and who were honorably discharged therefrom, and all persons who were engaged in such military or naval service during any of said years, any time between September 16, 1940 and July 25, 1947, or any time during the national emergency between June 25, 1950 and January 31, 1955, who are now or may hereafter be on inactive or reserve duty in such military or naval service, not including, however, persons who were convicted by court-martial of disobedience of orders, where such disobedience consisted in the refusal to perform military service on the ground of alleged religious or conscientious objections against war shall be preferred for appointment to civil offices, positions, and places of employment in the classified service of the county, provided they are found to possess the business capacity necessary for the proper discharge of the duties of such office, position, or place of employment as determined by examination for original entrance.
     The Civil Service Commission on certifying from any existing register of eligibles resulting from the holding of an examination for original entrance or any register of eligibles that may be hereafter created of persons who have taken and successfully passed the examinations provided for in this Division for original entrance commenced prior to September 1, 1949, shall place the name or names of such persons at the head of any existing eligible register or list of eligibles that shall be created under the provisions of this Division to be certified for appointment. The Civil Service Commission shall give preference for original appointment to persons as hereinabove designated whose names appear on any register of eligibles resulting from an examination for original entrance held under the provisions of this Division and commenced on or after September 1, 1949 by adding to the final grade average which they received or will receive as the result of any examination held for original entrance, five points. The numerical result thus attained shall be applied by the Civil Service Commission in determining the position of such persons on any eligible list which has been created as the result of any examination for original entrance commenced on or after September 1, 1949 for purposes of preference in certification and appointment from such eligible list.
     Every certified Civil Service employee who was called to, or who volunteered for, the military or naval service of the United States at any time during the years specified in this Division, at any time between September 16, 1940 and July 25, 1947, or any time during the national emergency between June 25, 1950 and January 31, 1955, and who was honorably discharged therefrom, who is now or who may hereafter be on inactive or reserve duty in such military or naval service, not including, however, persons who were convicted by courtmartial of disobedience of orders where such disobedience consisted in the refusal to perform military service on the ground of alleged religious or conscientious objections against war, and whose name appears on existing promotional eligible registers or on any promotional eligible register that may hereafter be created, shall be preferred for promotional appointments to civil offices, positions, and places of employment in the classified civil service of any county coming under the provisions of this Division. The Civil Service Commission shall give preference for promotional appointment to persons as hereinabove designated whose names appear on existing promotional eligible registers or promotional eligible registers that may hereafter be created by adding to the final grade average which they received or will receive as the result of any promotional examination commencing prior to September 1, 1949 three-fourths of one point for each 6 months or fraction thereof of military or naval service not exceeding 30 months, and by adding to the final grade average which they will receive as the result of any promotional examination held commencing on or after September 1, 1949 seven-tenths of one point for each 6 months or fraction thereof of military or naval service not exceeding 30 months. The numerical results thus attained shall be applied by the Civil Service Commission in determining the position of such persons on any eligible list which has been created or will be created as the result of any promotional examination held hereunder for purposes of preference in certification and appointment from such eligible list. No person shall receive the preference for a promotional appointment granted by this Section after he has received one promotion from an eligible list on which he was allowed such preference and which was prepared as a result of an examination held on or after September 1, 1949. No person entitled to preference or credit for military or naval service hereunder shall be required to furnish evidence or record of honorable discharge from the armed forces before any examination held under the provisions of this Division but such preference shall be given after the posting or publication of the eligible list or register and before any certification or appointments are made from the eligible register.