Sec. 21. MILITARY SERVICE. Members of the Pension System engaged in active military service required because of a National Emergency shall not be required to make the monthly payments into the Pension System Fund provided for in this Act, nor shall they lose any previous years of service with the Police Department caused by such military service. Such military service shall count as continuous service in the Police Department, provided that when the member is discharged from the military service he shall immediately return to his former duties with the city Police Department. The city, however, shall be required to make its regular monthly payments into the Pension System Fund on each member while he is so engaged in such military service. In the event of death of a member of this Pension System, either directly or indirectly caused from such military service, his widow or dependent parent or other dependents shall not be entitled to receive any benefits from this Fund.