8 CFR 328.1 - Definitions.
As used in this part:
Honorable service means only that military service which is designated as honorable service by the executive department under which the applicant performed that military service. Any service that is designated to be other than honorable will not qualify under this section.
Service in the Armed Forces of the United States means:
(1) Active or reserve service in the United States Army, United States Navy, United States Marines, United States Air Force, or United States Coast Guard; or
(2) Service in a National Guard unit during such time as the unit is Federally recognized as a reserve component of the Armed Forces of the United States.