The purpose of this study was to determine the effects of the integration of automatic speech recognition (ASR) and spatial audio display technologies on noisy, cognitively demanding armored vehicles. Subjects were instructed to give ASR voice commands in response to simulated monaural or spatialized audio radio communications, while performing a tank-driving task in different levels of ambient tank noise. Independent variables were auditory display, number of talkers giving radio output, and background noise level. The dependent variable was overall subject workload ratings as measured by the National Aeronautics and Space Administration Task Load Index (NASA TLX). Workload data indicated that spatialized audio radio communications, used with and without head trackers significantly decreased overall workload in the radio communication task. There were no other significant effects. These data support previous human performance data. The need for workload measures that examine multiple interfaces is discussed, and a workload modeling tool is recommended.