Howdy,

From the 2009 USAC Rulebook:

1B(b) Races for 17-18, U23 or elite riders (including national championships) that are used to qualify riders for national teams or international competition have the option of using UCI rules, either completely or in part, provided that notification is given to the riders 60 days prior to the event.

and

1M(e) Bicycles must meet current UCI technical regulations at events that select 17-18, U23 and elite riders for international competition or national teams. All bicycles used in National Championships (for age 17 and older riders) and NRC races must comply with the current UCI regulations

So unless there is some weird qualification in effect and you fall within that category my read would be no.