See
this thread, starting at the post that I've linked (and maybe some above) for my thoughts on the topic.
TL;DR - I don't think full-on agile is appropriate for a FRC project. It's quite well suited when there are distinct iterations that you can "deliver". Another poster in that thread made the point that the requirements change very little once they're delivered (in 12 days now, can you believe it?!?!)