a16z's American Dynamism team picked 50 companies rebuilding the industrial foundation behind U.S. and allied defense (October 2026). This year's theme is "Production is Deterrence": the list is organised in three connected pillars, Inputs (materials and power), Factories (the plants, tools and software that build at volume) and Systems (the drones, ships, missiles, aircraft and spacecraft that deter). Categories follow the source's own pillars.