20 CFR §416.216

1. (a)General rule. For purposes of this part, overseas means any location outside the United States as defined in § 416.215; i.e., the 50 States, the District of Columbia and the Northern Mariana Islands. You may be eligible for SSI benefits if you live overseas and if—
   1. (1)You are a child as described in § 416.1856;
   2. (2)You are a citizen of the United States; and
   3. (3)You are living with a parent as described in § 416.1881 who is a member of the armed forces of the United States assigned to permanent duty ashore overseas.
2. (b)Living with. You are considered to be living with your parent who is a member of the armed forces if—
   1. (1)You physically live with the parent who is a member of the armed forces overseas; or
   2. (2)You are not living in the same household as the military parent but your presence overseas is due to his or her permanent duty assignment.