SECTION 1. The Civil Service Act is hereby amended, by adding thereto the following section to be known as section thirty:
"SEC. 30. A person who, when the Civil Service Board informs the Military Governor and the Commission of its readiness to certify an eligible list as provided in section twenty-five, is performing the duties of any of the executive positions described in section five by detail from the military or naval service of the United States shall, upon receiving an honorable discharge therefrom, become a civil servant holding the position, the duties of which he has been performing, with the same immunity from competitive examination as that secured to certain civilian employees by section twenty-two, subject, however, to the proviso of that section."