Any Senior Executive who elects to participate in the Plan shall become a Participant in the Plan immediately upon enrolling as a Participant by the method required by the Plan Administrator. Any Senior Executive receiving Employer Additions shall become a Participant on the date of the initial Employer Addition, if the Participant has not enrolled under the preceding sentence. An individual shall remain a Participant in the Plan until all amounts credited to the Participant’s Account have been distributed to the Participant or the Participant’s Beneficiary.