In addition to all other authority now provided by law for the investment of funds by executors, administrators, conservators, trustees or other fiduciaries, all executors, administrators, conservators, trustees or other fiduciaries may legally invest fiduciary or trust funds in any loan which has insurance or guaranty under the servicemen’s readjustment act of 1944 as from time to time in force, or as to which a commitment for any such insurance or guaranty has been made without regard to the limitations, restrictions and requirements of any other statutes, or of any rules of law respecting investments by executors, administrators, conservators, trustees or other fiduciaries.