From the U-15 tourney website:
Championship Roster Size
24 players per team MAX � four coaches and four chaperones (coaches may double as chaperones).
This can't possibly be called a U-15 "National" Championship unless the Crabs attend. And they are not attending.
with teams from California, Texas, Washington St., Florida, Georgia, Arizona and the Carolina's, as well as all of the traditional hot beds and 3 regional play in tournaments I would say this clearly is a "National" tournament and since it is open to any organization in the country as well as being run by the National Governing body of the sport, I think it is fair to call it a "Championship" even if the Crabs choose not to participate. If tiger would decides to not play in the US Open does that mean that it is no longer a Championship?
