No problem! 
With FBI Agent being a Law Enforcement position, his was in an age 50 w/20 years of service for full retirement position (although I expect most stay around). Not sure how they would process his paperwork though - i.e., if they let him do it as a voluntary (early with a couple months reduction) retirement or just a resignation from service where he could come back to federal service at some point and not collect any FERS supplement payments yet.
But then I just thought of this as some have talked about banked annual leave use and "early" retirement - I *BET* he has banked SICK LEAVE, which actually goes towards your years of service. Hell, I had about 6 weeks of sick leave that added about a month to my service time and most (healthy) men tend to have a year or more of SL banked that could be added to his time in service - meaning not only enough to get to the "March" date, but he probably had enough to get to his May 50th birthday date too.
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