The directors of the state institutions listed in Section 41-7-73 each may receive any monies that the United States government may offer as federal aid in taking care of and giving special attention to those persons who served with the Armed Forces of the United States during time of war and who are now in or may hereafter be in any of those state institutions. Each of those directors may expend that part of the money paid to him or his institution, according to his best judgment and the requirements of the United States government under which the money is received.