6 U.S. Code § 578
6 U.S. Code § 578 is about Definition. It is under Subchapter XIII (Emergency Communications) of Chapter 1 (Homeland Security Organization) of Title 6 (Domestic Security) of the Code.
In this subchapter, the term “interoperable” has the meaning given the term “interoperable communications” under section 194(g)(1) of this title.