Every savings bank, including any savings bank organized under a special charter as a stock company previous to March eighth, one thousand eight hundred and seventy-seven, may invest moneys deposited with it in:
(a) Veterans' loans under the provisions of the Veterans' Business Loan Act (1944) (P.L.1944, c. 126), as amended and supplemented from time to time; and
(b) Loans made to veterans under the provisions of Title III of the Servicemen's Readjustment Act of 1944 (Public Law 346, 78th Congress, Chapter 268-2d Session), as amended or supplemented from time to time, in accordance with the rules and regulations made thereunder; provided, the Administrator of Veterans' Affairs shall guarantee or make a commitment to guarantee any such loan under said Act of Congress.