any flag that represents the nation of a visiting diplomat or a representative of the government of such nation visiting the public building at which the flag is displayed;
in the case of a Member of Congress, the State flag of the State represented by such Member that is located outside or within the office of the Member;
in the case of a religious liturgy or ceremony at a military installation or facility, any flag that represents a religious organization or church that is covered by section 501(c)(3) of the Internal Revenue Code of 1986 and exempt from tax under section 501(a) of such Code;