As used in this part, the term:

(a) Act means the Public Health Service Act, 58 Stat. 682, as now or hereafter amended.

(b) Department means the Department of Health and Human Services.

(c) Secretary means the Secretary of Health and Human Services.

(d) Service means the Public Health Service.

(e) Surgeon General means the Surgeon General of the Public Health Service.

(f) Commissioned officer or officer, unless otherwise indicated, means either an officer of the Regular Corps or an officer of the Reserve Corps.