Basically a resume and behavioral experience based interview that lasted 1-2 days. Went over my resume and experiences in explicit detail to judge fit in the organization. Spoke with 3 different senior officers during the process and met with many other officers and employees. The interview did not seem to be planned out specifically, but definitely had a flow to it. My advice is to relax and enjoy the process. Not much to prepare. Just be yourself and know your story. A good reason why you want the job is good too. Confidence is the most important thing!