(a) Any person subject to this chapter who commits an act of sexual intercourse with a female not his wife, by force and without consent, is guilty of rape and shall be punished by death or such other punishment as a court-martial may direct.
(b) Any person subject to this chapter who, under circumstances not amounting to rape, commits an act of sexual intercourse with a female not his wife who has not attained the age of sixteen years, is guilty of carnal knowledge and shall be punished as a court-martial may direct.
(c) Penetration, however slight, is sufficient to complete either of these offenses.