Amateur radio operators who want to be official NET AROs (Amateur Radio Operators!) need to bee certified by NET ARO Radio Training Liaisons (RTLs). A description of the ARO Standards and Certification process and information on how to find your RTL can all be found from the Portland Bureau of Emergency Management (PBEM) NET page for this purpose. You will find the most current version of the ARO Task List on that page. Here is a page of useful links that support the ARO Task List.
There are a variety of other resources available to prospective and certified AROs.
Finally, there are radio nets and practice opportunities specifically designed for Portland NET amateur radio operators. You do not need to be an official ARO to participate! Below and links to other pages that describe these.