A participant shall continue to be an active
participant of the plan so long as he is a member of the eligible
class of employees. He shall become an inactive participant immediately
if he ceases to be a member of the eligible class of employees or
terminates employment. He shall cease participation completely upon
the later of his receipt of a total distribution of his nonforfeitable
accrued benefit under the plan or the forfeiture of the nonvested
portion of the accrued benefit.