(a) Except as otherwise authorized under this section, the following are prohibited:

(1) Possessing a weapon.

(2) Carrying a weapon.

(3) Using a weapon.

(b) This section does not apply to any agency or Department of Defense component that has received prior written approval from the Pentagon Force Protection Agency or the Installation Commander to carry, transport, or use a weapon in support of a security, law enforcement, or other lawful purpose while on the Pentagon Reservation.