2009, USAC will be changing the current category names:
Beginner, Sport and Expert to
Cat 3, Cat 2 and Cat 1 (respectively)
They're also getting rid of the semi-pro class. Also, instead of having the PSE class (pro/semi-pro/elite expert) its cat 1/pro open.
The owner of USAC is doing this to make it easier and less confusing for people to race road and mountain.