The microwave and millimeter wave monolithic integrated circuits (MIMIC) program is a Defense Advanced Research Projects Agency initiative to provide affordable, reliable, and reproducible microwave and millimeter-wave circuits in monolithic format for use in US Department of Defense (DoD) systems. The objectives of the program, progress being made toward meeting those objectives, and some planned future work are described. The overall program object is to provide the needed microwave and millimeter-wave products at a price that will allow their use in fielded DoD systems, that meet all required electrical, mechanical, and environmental parameters, and that continue to operate reliably for the time necessary to fulfil their intended application. Programs in progress include work on gallium arsenide epitaxial growth techniques; multiple chip ceramic packages, process, device, and circuit modeling; on-wafer testing techniques; and advanced fabrication techniques. >