Also note that if you've already gotten endorsement from the USDA, that
will expire. You can get another endorsement, as long as their rabies vaccine hasn't lapsed (as Reinadeluz said), but it doesn't automatically rollover or anything - it's only valid for 4 months from the date they stamp on the form.
If you haven't done the USDA endorsement yet then it's no problem, just bring in your paperwork (including rabies vaccine certificate(s)) and you'll be fine.

And as Reinadeluz said, you'll still need to do the tick/tapeworm treatment 24-48 hours pre-flight.