Either in the admin manual or in some odd part of the FIRST website, it says that you can take time off, and when you come back you can either take the number back or get a new (rookie) number.
I found this:
Quote:
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2. A returning team that has not been in a competition for three years would be considered a Rookie; that is, going into the 2015 season, the team cannot have competed in seasons 2014, 2013 or 2012. Teams, whose last competition season was 2011 or earlier, can return during the 2015 season as a Rookie with a 2015 Rookie team number, OR, they can continue as a veteran with their original team number. Teams that choose to register as a veteran are not eligible for the above listed Rookie incentives and recognition.
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http://www.usfirst.org/roboticsprogr...-team-criteria
I think you would be able to come back just fine after one year though, not waiting three.