I am a mathematics PhD student in the US graduating this year. I recently received a very good 3 year postdoc offer in Europe, which I have to accept or decline in early December. Not being a big risk taker, I am leaning toward accepting the offer. I have also applied for an NSF postdoc, which I would prefer to the European offer but am obviously not a shoe in to get--and the results of which won't be known until February. If I accept the European offer, I will have to decline the NSF postdoc if awarded.
If I do that, would I be allowed to reapply for the NSF next year?