(a) Definitions
For purposes of this section:
(1) Headquarters offices
The term “headquarters offices”, with respect to agencies, offices, or other administrative units of the Department, means the offices, functions, and employee positions that are located or performed—
(A) in Washington, District of Columbia; or
(B) in such other locations as are identified by the Secretary for purposes of this section.
(2) Field structure
The term “field structure” means the offices, functions, and employee positions of all agencies, offices, or other administrative units of the Department, other than the headquarters offices, except that the term does not include State, county, or area committees established under section 590h(b)(5) of title 16. The term includes the physical and geographic locations of such agencies, offices, or other administrative units.