SECTION 7. Division of special police services

There shall be within the division of special police services three bureaus, which shall be designated as the bureau of facility security, the bureau of motor vehicle enforcement and the bureau of metropolitan district operations which shall provide services, including but not limited to, school crossing guards and the protection of watershed properties managed by the metropolitan district commission. The head of each such bureau shall be designated by the colonel and shall hold such rank or temporary rank as the colonel may determine. The colonel may from time to time assign to each bureau such uniformed members and other employees of the department as he may deem necessary to carry out its duties.