I am seeing a lot of talk about first and second years at L4 and it seems like a lot of girls do L4 more than once. As my DD is just moving up to L4, I'm curious about this. Are we talking about AAU or USAG L4? How common is it to repeat L4? Why do they repeat? Are there certain skills that give the girls trouble? How many years did everyone's DDs do L4 and, if more than one, why?