Section 831.1612 - Elections of Retirement Coverage, exclusions from retirement coverage, and proportional annuity computations(a)Elections of coverage.(1) The Department of Homeland Security must provide an employee who is a customs and border protection officer on December 26, 2007, the opportunity to elect not to be treated as a customs and border protection officer under section 535(a) and (b) of the Department of Homeland Security Appropriations Act, 2008, Public Law 110-161 , 121 Stat. 2042.(2) An election under this paragraph (a) is valid only if made on or before June 22, 2008.(3) An individual eligible to make an election under this paragraph who fails to make such an election on or before June 22, 2008, is deemed to have elected to be treated as a customs and border protection officer for retirement purposes.(b)Exclusion from coverage. The provisions of this subpart and any other specific reference to customs and border protection officers in this part do not apply to employees who on December 25, 2007, were law enforcement officers under subpart I of this part or subpart H of part 842 within U.S. Customs and Border Protection. These employees cannot elect to be treated as a customs and border protection officer under paragraph (a) of this section, nor can they be deemed to have made such an election.(c)Proportional annuity computation. The annuity of an employee serving in a primary or secondary customs and border protection officer position on July 6, 2008, must, to the extent that its computation is based on service rendered as a customs and border protection officer on or after that date, be at least equal to the amount that would be payable- (1) To the extent that such service is subject to the Civil Service Retirement System, by applying section 8339(d) of title 5, United States Code, with respect to such service; and(2) To the extent such service is subject to the Federal Employees' Retirement System, by applying section 8415(d) of title 5, United States Code, with respect to such service.