Subject to the provisions of this Division 4, the Deferred Retirement Option Program, hereinafter referred to as the DROP, is a program under which a covered employee of the police retirement fund or the firefighter’s retirement fund may elect to participate, deferring receipt of retirement benefits while continuing employment with the City.  The deferred monthly benefits shall accrue on behalf of the covered employee, plus interest compounded monthly, for the specified period of the DROP participation, as provided herein.   Upon termination of employment, the covered employee shall receive the total DROP benefits and begin to receive the previously determined normal retirement benefits.  Participation in the DROP does not guarantee employment for the specified period of the DROP.