The engineering research wing of the United States Defence Department DARPA wants to use machine learning to develop new technologies for use in combat. AIs can now be used not just to recognise objects that already exist but also to devise new ones. Machine learning is already used in some engineering and design contexts, and DARPA wants to expand that usage. AIs programmed to understand fundamental physics will be set engineering challenges, giving them free rein to supply out-of-the-box solutions that will help with innovative design. It is hoped that AI will greatly assist the US government in developing new machines and components for military purposes.