Leave ordered under this section may be taken in the United States or its territories, including American Samoa, the Commonwealth of Puerto Rico, Guam, the Commonwealth of the Northern Mariana Islands, and the United States Virgin Islands. In cases in which a member of the Service has official orders to an unaccompanied post and in which the family members of the member reside apart from the member at authorized locations outside the United States, the member may take the leave ordered under this section where that member’s family members reside, notwithstanding section 10305 of title 5.