Sick Leave & BackDROP Period

Questions regarding sick leave. I have around 22 months of employment remaining before I reach the 80 and out. I have around 1900 hours of sick leave currently. Does sick leave still contribute towards your credible service period? If I elect to backdrop, does this apply to the backdrop period if I do not count this towards credible service? Thank you!

 Yes, you will get one month of credited service for each block of 168 hours of unused sick leave you have at retirement. While this will increase the amount of your benefit, unused sick leave cannot count toward eligibility for retirement or as part of the BackDROP period. That is, the months of unused sick leave will not make you eligible for retirement (or BackDROP) sooner, but will increase the amount of your payment once you have retired.