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This empirical field study describes the wearable system, the study method used, and summarizes the experiences of aircraft maintenance specialists who participated in a field usability evaluation conducted at their United States Air Force Reserve facility in the summer of 1996. This usability evaluation aimed at collecting accurate, detailed information for use in the evolutionary design and development of wearable systems for vehicle maintenance workers. All participants were able to complete their tasks using the wearable prototype and they expressed willingness to use such a system in the future. Also, we report on future requirements for wearable maintenance aids elicited from these users.