The Advanced Concepts effort worked to "enable future Air Force missions through the discovery and demonstration of emerging revolutionary technology." Reviews of technological fields were conducted for launch, near-space, and in-space propulsion. The reviews yielded a set of key technological challenges that were of particular importance for the effort. Individual, small-scale research projects were conducted to address the key challenges. One research effort, FRC propulsion, was successfully transitioned. Several other projects including: radiometric forces for long duration flight in near-space, liquid droplet thrusters for constellation maintenance, and HEATS for responsive, high capability microsatellite operation look promising.