Numbering only six, the Null-class Advanced Recon Commandos were the first clones of Jango Fett created by the Kaminoan cloners, and the prototypes for the Grand Army of the Republic. They were deemed a failure by the Kaminoans and were not put into mass-production. They were saved from termination by Mandalorian mercenary Kal Skirata who later adopted all of them. All of the Nulls were named after Mandalorian warriors.