This talk explores what went well, the opportunities for improvement and how that market has evolved since. We also look to the future of the discipline with MITRE recently introducing the concept of adversary emulation profiles as part of the work on ATT&CK, this talk also explores the opportunities this creates in threat led security testing and vulnerability management and how related disciplines .Participants will learn:An understanding of how adversary emulation is applied in red team security tests.Lessons learned from practical experience in Threat Led Penetration Testing: the good, the bad, the ugly.How to apply Cyber Threat Intelligence to a security test.Where CTI for adversary emulation in testing is heading.Why teams should be purple.