The Simulation and Training Technology Center (STTC) Human Dimension, Simulation and Training Directorate, Army Research Laboratory (ARL) completed a three year, Army Technology Objective Development program titled "Scalable Embedded Training and Mission Rehearsal (SET MR ATO)" which focused on embedded training (ET) for the current force, mounted and dismounted. The goal was to develop an advanced technology demonstration that would mature technology to train Soldiers using operational equipment. This would provide accessible and deployable training for the Army. Elements of Live, Virtual and Constructive were used to provide a training common component approach that could be applied to the Abrams, Bradley and Stryker vehicles and dismounted Soldiers. The key finding can be described as a soldier and platform-centric approach to training. In order to fully implement embedded training on operational equipment an understanding of what needs to be trained and where within the training spectrum (Individual, Crew/Team, Functional and Combined Arms and Battle Staff) needs to be conducted before implementation. Technology is no longer an obstacle or barrier to fully embed training into mounted vehicles. Challenges remain for Embedded Training in dismounted which focus on size, power and weight constraints. This paper will identify key technologies developed and lessons learned that can be applied to future embedded training procurements (i.e. Ground Combat Vehicle) and future technology development.