42 CFR § 31.1 - Meaning of terms.
As used in this part, the term:
(b) Service means the Public Health Service.
(e) First-class stations means a hospital operated by the Service.
(f) Second-class station means a medical relief facility, other than a hospital of the Service, under the charge of a commissioned officer.
(i) Designated physician means a physician holding an appointment to act regularly for the Service for a class or classes of specified beneficiaries at a place where there is no medical relief station.
(k) Active duty means active duty status as distinguished from being on inactive status or retired and includes periods of authorized leave or liberty.
(l) Dependent members of families in the case of male personnel means the lawful wife, the unmarried children (including stepchildren or adopted children) under 21 years of age, and the father or mother if in fact dependent upon such son for his or her chief support; and in the case of female personnel, the unmarried children (including stepchildren or adopted children) under 21 years of age if their father is dead or they are in fact dependent on such mother for their chief support, the father or mother if in fact dependent upon such daughter for his or her chief support, and the husband if in fact dependent upon such wife for his chief support: Provided, however, That in the case of members of the Women's Reserve of the Coast Guard the husbands of such members shall not be considered dependents.