Abstract : Because the scope of work included both the development of the (RGG) Rotating Gravity Gradiometers and studies of platform requirements, this Final Report is written in two volumes to better distinguish between these two major tasks. Volume 1 addresses the tasks associated with the sensor development and Volume 2, written under subcontract by Incosym, Inc., presents the findings and preliminary specifications for an inertial platform to support the RGG in airborne environment. The performance goals for the RGG remain identical to the original AFGL/DMA/DARPA statements made for the two prior AFGL contracts. Specifically, Hughes has been directed toward achieving gravity gradiometer performance in an airborne environment such as that provided by a C-135/C-141 aircraft flying in benign weather conditions. The gradiometer system performance goal is to determine the components of the gravity gradient tensor to an accuracy such that the individual RGG contributes no more than one (1) Eotvos Unit (EU) of noise when measured with an equivalent 10-second integration time.