What does the USFA mean by Division I, II and III?

Division categories are used at NACs and Summer Nationals for different levels of fencing (not to be confused with the geographic division discussed earlier). Division I requires a fencer to have a classification rating of C, B or A. Division II requires a fencer to have a classification rating of C, D, E or U. Division III requires a fencer to have a classification rating of D, E or U. In summer nationals only, there is also a Division I-A. Division I-A is only age restricted - fencers must have been born in 1990 or earlier.