The AFP has never had a Royal Commission and it needs to happen because many of the issues that permeate the state and territory police forces have often been found to involve members of the AFP. You just need to read the transcripts of the Wood Royal Commission to gain an understanding of the degree to which members of the AFP are involved in, or have been involved in, corrupt activities.
People like Mark Standen, former Assistant Director of the NSW Crime Commission who is currently in gaol are products of the culture that existed for many years in the AFP.
There are many many examples of why such a Royal Commission is needed, not the least of which is the fact that there are many decent members and former members of the AFP who would dearly like to be able to say they serve or served in the AFP and to do so with a degree of honour instead of embarrassment.