When in May and July 1946 the provisions now represented by regs. 30A to 30AF were reframed in their present form the period over which, as the law then stood, they were to operate was a short one. The National Security Act 1946 had been passed on 18th April 1946, though the date of its commencement was 16th May 1946. The new s. 19 which it inserted in the National Security Act 1939-1943, under which the regulations were made, provided that all regulations made thereunder should cease to have effect at midnight on 31st December 1946. The period from his discharge limited in the definition of discharged servicemen was two years, not four. In Real Estate Institute of New South Wales v. Blair [1] part of the argument in support of the validity of the regulations was that they continued in force until 31st December 1946 and that a tenancy could be created thereunder until that date. Hostilities had not ceased until 2nd September 1945. It was in these circumstances that the Court decided that regs. 30A to 30AF were not ultra vires. It was considered that they fell within that aspect of the defence power which enables the Federal legislature to provide for the re-establishment in civil life of persons who have served with the defence forces upon discharge (per Latham C.J. [2] ). Rich J. said: - "I do not think that it is beyond the scope of the defence power to provide reasonable facilities for enabling men of the fighting services to re-establish themselves in civil life during a reasonable time after they have been discharged; and, in existing circumstances, I do not think that the temporary continuance of the provisions which have been challenged, in the form in which they now stand, is, in its application to discharged servicemen, outside the scope of the defence power." [3] . Williams J. said: - "During hostilities legislation under the defence power requiring householders to billet members of the forces, and probably also members of their families, could be valid. And during the period of demobilization legislation to the same effect might be valid. By analogy to billeting, legislation passed in war-time requiring citizens to allow members of the forces and their families to reside in unoccupied houses could also be valid. We are now in a period when the defence power is contracting. In my opinion the operation of the defence power in peace-time could not be wide enough to authorize legislation, otherwise than under s. 51 (xxxi.), to make dwelling houses owned by individuals available as dwelling houses for discharged members of the forces. But the present regulations can, I think, be justified as an exercise of the defence power during hostilities and the immediate aftermath. They are of temporary duration and any statutory rights they create would not continue after their expiration." [1] . Starke J. and Dixon J. confined themselves to the case of discharged servicemen and treated the regulations as within the defence power because "they secure in certain cases dwelling houses for members and discharged members of the armed Forces required by reason of war to live in premises other than premises occupied by them or by members of their household as a home": per Starke J. [2] . Dixon J. pointed out that the direction of the defence power had been changed: its direction was no longer towards sustaining the conflict but towards measures calculated to liquidate the organization for war and restore the conditions of peace [3] .