This volume presents the range of technological results which have been achieved within the ARPI. Many of these results are having a fundamental impact on research and applications well beyond the scope of ARPI itself. Five lead articles introduce the program and its structure. They explain how the more mature results of individual projects are transferred through technology integration experiments (TIEs), then integrated feasibility demonstrations (IFDs) through to fielded applications. The main body of this volume then comprises one paper from each group or project within the ARPI. Each paper seeks to introduce the technological contribution of the group’s work and provides a pointer to other work of that group. A specific technical contribution that has been made by the ARPI work of that group is usually described.