; and (3) the term member of an armed force means a member of any of the armed forces, as defined in section 101(a)(4) of title 10, United States Code, or a member of the National Guard, as defined in section 101(3) of title 32, United States Code. (b) Required identification (1) In general Each Federal law enforcement officer or member of an armed force who is engaged in any form of crowd control, riot control, or arrest or detainment of individuals engaged in an act of civil disobedience, demonstration, protest, or riot in the United States shall at all times display identifying information in a clearly visible fashion, which shall include the Federal agency and the last name or unique identifier of the Federal law enforcement officer or for a member of an armed force, the last name or unique identifier and rank of the member. (2) Specific prohibitions (A) Covering of identifying information A Federal law enforcement officer or member of an armed force may not tape over or otherwise obscure or conceal the identifying information required under paragraph (1) while the officer or member is engaged in any form of law enforcement activity described in paragraph (1). (B) Use of unmarked vehicles A Federal law enforcement officer or member of an armed force may not use an unmarked vehicle for the apprehension, detention, or arrest of civilians while the officer or member is engaged in any form of law enforcement activity described in paragraph (1). (c) Limitation on crowd control authority (1) In general Except as provided in paragraph (2), a Federal law enforcement officer or member of an armed force may only be authorized to perform any form of crowd control, riot control, or arrest or detainment of individuals engaged in an act of civil disobedience, demonstration, protest, or riot on Federal property or in the immediate vicinity thereof, which shall include the sidewalk and the public street immediately adjacent to any Federal building or property. (2) Exceptions (A) State and local request for assistance