This paper details the results of a cognitive task analysis of dedicated after action review (AAR) practitioners, namely Combat Training Center Observer/Controllers. This analysis is being done in support of an Army Research Institute sponsored investigation into the theoretical basis of the AAR. The AAR is a facilitated, professional discussion of a training event by the training audience that compares trainee performance against task standards and training objectives. It is a significant part of training. This paper covers the portion of the AAR investigation that is examining AAR practices through detailed interviews of samples of AAR practitioners. These extensive, two-hour long interviews include over sixty open-ended questions that cover AAR practitioner deliberation across the total training cycle, including planning and preparation of training, training execution, AAR preparation and execution, and follow-up. The data obtained will inform a broad description of as-is AAR doctrine and practices. This paper explains the methodology used to conduct the analysis and the detailed synopsis of OC thought towards the role of the AAR within training, the preparation, presentation, and follow-up of the AAR, and desired results of the AAR.