The Mobil 1 12 hours of Sebring, was for many years the season opener of ALMS the American Le Mans Series in Florida, however with ALMS/Grand-Am merger, the resulting series TUSC holds their second race of the season here. And after missing Sebring 12 hour for the first two years I started marshaling because I registered for the Australian GP which is the same weekend two years in a row, in 2014 I finally made my Sebring 12 hour debut.
Registering for the event is very straight forward. If you are a member of the SCCA you simply reach out to the Central Florida SCCA region. However, there were many international marshals volunteering there so your credentials should get you in no matter where you come from.
Please share your experience in the comments below.