The purpose of this quantitative correlational design dissertation was to determine if, and to what extent, a relationship existed between Advanced Joint Terminal Attack Control Training System (AJTS) users' perceived usefulness, perceived ease of use, and intention to use AJTS. AJTS is a virtual reality simulation-based training system. Three research questions guided this study. Research question one analyzed the correlation between AJTS users' perceived usefulness and intention to use, question two analyzed the correlation between AJTS users' perceived ease of use and intention to use, and question three analyzed the correlation between AJTS users' perceived usefulness and perceived ease of use. This study used the Technology Acceptance Model framework to determine if, and to what extent, a relationship existed between AJTS users' perceived usefulness, perceived ease of use, and intention to use the AJTS. The sample consisted of 87 AJTS users located in the United States. Data collection used the Virtual Reality Hardware Acceptance Model scales and was analyzed using Kendall's tau-b. Results indicated statistically significant correlations between all variables with perceived usefulness and intention to use statistically significant at [tau]b = 0.055, < 0.001, perceived ease of use and intention to use statistically significant at [tau]b = 0.37, < 0.001, and perceived ease of use and perceived usefulness statistically significant at [tau]b = 0.36, < 0.001. The results show that the Technology Acceptance Model variables can produce statistically significant results, providing information for researchers and practitioners analyzing the implementation of virtual-reality technology in the defense sector. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]