Final answer:
The term refers to foreign service locations outside the main continental United States, including the District of Columbia and Hawaii, where Congress has authority over federal installations.
Step-by-step explanation:
For the purpose of Foreign Service Assignment (FSA-I), the term in question likely refers to locations outside the contiguous 48 states, the District of Columbia, and Hawaii. According to Section 8 Clause 17, Congress has the power to build a national capital (Washington D.C.) on land ceded by states, and has authority over federal installations. The involvement with Hawaii and its relationship with the United States provides an example of how territories outside the contiguous states interact with federal law and jurisdiction.