Abstract. Unmanned aerial systems (UAS) are increasingly used in military operations. Successful operations, despite no human onboard, are heavily human-dependent. A review of Army UAS accidents was completed to evaluate the role of the human in these accidents so as to inform future research and operations. Reports of 288 accidents occurring between 2010 and 2015 were obtained. Report elements including aircraft type, accident findings, and personnel information were reviewed. About 76% of accidents were not due to human error, specifically based on contributions of air and ground crew in flight operations. No clear conclusions were identified to aid in determining the contribution of the human to the accident. Recommendations for more rigorous investigations, to include capturing objective data of personnel, are put forth.