FERS Federal Fact Check - What if you become a survivor before your annuity kicks in?

My husband and I both had careers with the National Park Service. He carried the family insurance for us. He retired in 2021 and did not select me for survivor benefits since I also worked for the federal government. I now want to resign and defer or postpone my retirement until I meet the minimum age. I am 54 (3/10/69). If my husband dies before me, do I still keep federal health benefits with a deferred retirement? What would happen if he does before I reach the minimum age for my deferred retirement? https://bit.ly/45wp5bh