With the transfer of U.S. Army unmanned aircraft systems (UAS) from Military Intelligence to the Aviation Branch in 2003, the role of UAS changed from intelligence gathering to scout-reconnaissance (SR). SR requires close coordination between UAS and manned aircraft, necessitating that UAS operators acquire new communication and coordination skills. The objective of this research was to (a) identify manned-unmanned teaming (MUM-T) skills required for UAS operators, (b) define/prioritize training-critical MUM-T skills, and (c) determine benchmarks for assessing MUM-T performance for RQ-7B Shadow and other Army UAS. We first reviewed Army doctrinal material and regulations to identify (a) missions in which UAS operators must coordinate with helicopter pilots, (b) tasks required to perform these missions, and (c) UAS operator skills required to execute these tasks. Results of the review and analyses were confirmed by subject matter experts (SME), comprising senior Army UAS operators, SR helicopter pilots, and doctrine developers. SMEs identified training-critical SR skills for which (a) inadequate performance would jeopardize the mission, and (b) UAS operators graduating advanced individual training (AIT) performed poorly. Skills were rated for performance and training criticality, for attack and SR missions. Ratings were rank ordered for 25 skills critical to SR mission success. Perceived current performance levels varied greatly, indicating that many skills were not addressed in AIT, while others were adequately trained. Next, SMEs from manned and UAS communities proposed performance indicators for 20 of these skills deemed most relevant to MUM-T. For these skills a total of 140 prototype indicators were identified. Future research will refine these indicators into valid, reliable, and usable benchmark performance measures to assess proficiencies of UAS operators on MUM-T skills. These findings were briefed to project sponsors for UAS and Reconnaissance-Attack, for use in pinpointing the most critical MUM-T skills to train UAS operators.