(a) The following terms are used throughout this part and have the following meanings:

(1) Department means the U.S. Department of the Interior and any of its components.

(2) Secretary means the Secretary of the Interior.

(3) Bureau means each major program operating component of the Department, the Office of the Secretary, the Office of the Solicitor, and the Office of the Inspector General.

(4) Employee means a regular employee, a special Government employee, and a contract education employee in the Office of the Assistant Secretary—Indian Affairs or the Bureau of Indian Affairs, unless the text of a particular subpart, section, or paragraph indicates that either regular employees or special Government employees are not intended to be covered by that subpart, section or paragraph. Volunteers in National Parks whose services are accepted pursuant to 16 U.S.C. 18g are not employees.

(b) Specific definitions. Additional definitions of terms specifically associated with a particular subpart, section, or paragraph are found in that subpart, section, or paragraph.