3. When a veteran applies for employment to a position that is being filled through a competitive personnel system, the officer, board, or person whose duty it is to employ an individual to fill the available position shall investigate the qualifications of the veteran. If the veteran is found to possess the qualifications required for the position applied for, whether educational or by way of prior experience, and is physically and mentally able to perform the duties of the position applied for, the officer, board, or person shall employ the following: