An uncrewed aerial system (UAS) has been developed for observations of aerosol and cloud properties relevant to aerosol direct and indirect forcing in the marine atmosphere. The UAS is a hybrid quadrotor -- fixed wing aircraft designed for launch and recovery from a confined space such as a ship deck. Two payloads, Clear Sky and Cloudy Sky, house instrumentation required to characterize aerosol radiative forcing effects. The observing platform (UAS plus payloads) has been deployed from a ship and from a coastal site for observations in the marine atmosphere. We describe here the details of the UAS, the payloads, and first observations from the TowBoatUS Richard L. Becker (March 2022) and from the Tillamook UAS Test Range (August 2022). [ABSTRACT FROM AUTHOR]