This project covers the period from 1 August 1997 to 31 July 2000 and is focused on studies of middle atmosphere chemistry and dynamics. The project includes two major activities; 1) analysis and interpretation of the extensive MesoD dataset on tides and gravity waves gathered at the Urbana Atmospheric Observatory and 2) the two year deployment of the Na wind/temperature lidar at the Starfire Optical Range, NM to study gravity wave momentum, heat, and constituent transport. Key instruments of the MesoD Campaign include a Na wind/temperature lidar which is capable of 24 h observations, a Rayleigh lidar, MF radar, airglow imagers, and and airglow spectrometer. The dataset is being used to study tidal perturbations in middle atmosphere wind and temperature profiles, gravity wave propagation directions and their relationships to lower atmosphere sources and middle atmosphere winds, airglow gravity wave interactions, and Na chemistry. The Starfire Campaign begins in Spring 1998 and is focused on Na wind/temperature lidar measurements of gravity wave momentum, heat, and Na fluxes and the associated mean flow accelerations and cooling rates. These important but challenging observations are made feasible by using the impressive 3.5 m steerable telescope at the Starfire Optical Range for the lidar receiver. The Illinois airglow imager and Fourier transform spectrometer will also be deployed and operated at Starfire during the campaign.