Any employee of the county of Los Angeles may, with the approval of the board of supervisors
and subject to the rules of the civil service commission, be granted a leave of absence
without pay, for the purpose of permitting such employee to perform technical or specialized
work for the federal, state, or a municipal government during time of war or war emergency,
and retain for his own use from the federal, state or municipal government all compensation
and reimbursement for expenses, and may be so absent from the county service notwithstanding
other provisions of this chapter.