(b)
The Secretary may, by regulation, provide for the procurement and sale of stores designated by him to such civilian officers and employees of the United States, and such other persons, as he considers proper—
(1)
at military installations outside the United States; and
(2)
at military installations inside the United States where he determines that it is impracticable for those civilian officers, employees, and persons to obtain those stores from private agencies without impairing the efficient operation of naval activities.
However, sales to civilian officers and employees inside the United States may be made only to those residing within military installations.