SECTION 1. Section three of Republic Act Numbered Three hundred forty is hereby amended to read as follows:
"SEC. 3. Upon the death of an officer or enlisted man who has been retired or would, at the time when he died, have been entitled to retire under Section one of this Act, the surviving legitimate, adopted or acknowledged natural children of such officer or enlisted man and/or widow shall be entitled to receive in equal shares and with the right of accretion seventy-five per centum of the annual retirement pay which the officer or enlisted man was receiving or would have been entitled to receive if he had not died, the said amount to be payable in equal monthly installments: Provided, That no payment under this section shall be made to children after they have attained the age of twenty-one years or have married, nor to the widow if she remarries: Provided, further, That no payment whatever shall be made to the widow if her marriage to the deceased officer or enlisted man was contracted after his retirement from the service."