Measurements of O, He, and Ar from neutral gas mass spectrometers on four satellites (Ogo 6, San Marco 3, Aeros A, and AE-C) and inferred O2 and H densities from an ion mass spectrometer on AE-C have been combined with a neutral temperature and N2 density model, based on data from these four satellites and four incoherent scatter stations, to produce a global model of thermospheric composition in terms of inferred variations at 120 km. The data coverage is significantly improved over that of the similar Ogo 6 model in terms of atlitude, seasonal, and solar parameters, and the usefulness is expanded by the inclusion of additional gas species. The overall data set covers the time period from mid-1969 to mid-1975. The seasonal He variation is double tat of the Ogo 6 model on average, with maximum variation in the northern hemisphere. Ar variations at 120 km tend to be in phase with temperature variations and inverse to the He, O, and H variations.