Volunteers shall be entitled to receive a readjustment allowance at a rate not less than $125 for each month of satisfactory service as determined by the President. The readjustment allowance of each volunteer shall be payable on his return to the United States: Provided, however, That, under such circumstances as the President may determine, the accrued readjustment allowance, or any part thereof, may be paid to the volunteer, members of his family or others, during the period of his service, or prior to his return to the United States. In the event of the volunteer’s death during the period of his service, the amount of any unpaid readjustment allowance shall be paid in accordance with the provisions of section
5582
(b) of title
5. For purposes of the Internal Revenue Code of 1986, a volunteer shall be deemed to be paid and to receive each amount of a readjustment allowance to which he is entitled after December 31, 1964, when such amount is transferred from funds made available under this chapter to the fund from which such readjustment allowance is payable.