10 U.S.C. § 101(b)(1-5) (2010) (Title 10—Chapter 1: Definitions)
(b) Personnel generally. The following definitions relating to military personnel apply in this title:
(1) The term "officer" means a commissioned or warrant officer.
(2) The term "commissioned officer" includes a commissioned warrant officer.
(3) The term "warrant officer" means a person who holds a commission or warrant in a warrant officer grade.
(4) The term "general officer" means an officer of the Army, Air Force, or Marine Corps serving in or having the grade of general, lieutenant general, major general, or brigadier general.
(5) The term "flag officer" means an officer of the Navy or Coast Guard serving in or having the grade of admiral, vice admiral, rear admiral, or rear admiral (lower half).
50 U.S.C. § 426(7) (2010) (Title 50—Chapter 15: National Security--Subchapter D: Protection of Certain National Security Information)
For the purposes of this title [50 U.S.C. §§ 421 et seq.]:
(7) The terms "officer" and "employee" have the meanings given such terms by section 2104 and 2105, respectively, of title 5, United States Code.
28 CFR § 22.2(g) [28 CFR PART 22—CONFIDENTIALITY OF IDENTIFIABLE RESEARCH AND STATISTICAL INFORMATION]
(g) Officer or employee of the Federal Government
means any person employed as a regular or special employee of the U.S. (including experts, consultants, and advisory board members) as of July 1, 1973, or at any time thereafter.
28 CFR § 69.105(k) [28 CFR PART 69—NEW RESTRICTIONS ON LOBBYING]
For purposes of this part:
(k) Officer or employee of an agency
includes the following individuals who are employed by an agency:
(1) An individual who is appointed to a position in the Government under title 5, U.S. Code, including a position under a temporary appointment;
(2) A member of the uniformed services as defined in section 101(3), title 37, U.S. Code;
(3) A special Government employee as defined in section 202, title 18, U.S. Code; and,
(4) An individual who is a member of a Federal advisory committee, as defined by the Federal Advisory Committee Act, title 5, U.S. Code appendix 2.