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You must have missed the details in the article. OPM has listed on their website under ‘fork’. The deadline for acceptance is 6 Feb, and the resignation will be effective at the end of September. There is no back and forth with HR; you simply reply to their email with the word ‘resign’ or you don’t and remain employed until the loyalty police come around.
I sincerely hope many more employees than they anticipate avail themselves of this opportunity.