Section 21.1 - Purpose and scope of subpart A of this part(a) This subpart is issued by the Comptroller of the Currency pursuant to section 3 of the Bank Protection Act of 1968 (12 U.S.C. 1882 ) and is applicable to all national banking associations. It requires each bank to adopt appropriate security procedures to discourage robberies, burglaries, and larcenies and to assist in identifying and apprehending persons who commit such acts.(b) It is the responsibility of a bank's board of directors to comply with this regulation and ensure that a security program which equals or exceeds the standards prescribed by this part is developed and implemented for the bank's main office and branches (as the term "branch" is used in 12 U.S.C. 36 ) .56 FR 29564, June 28, 1991, as amended at 73 FR 22244, Apr. 24, 2008