Despite significant cybersecurity policy, a prioritization of funding, and increased cybersecurity workforce training, DoD operational testers continue to find critical cyber vulnerabilities in its Weapon and Control Systems that result in the warfighter's lack of ability to "fight through" when faced with a cyber-contested environment (United States Government Accountability Office, 2018). In order to improve these gaps, researchers agree that focus should shift from the compliance nature of cybersecurity to that of mission assurance nature of cyber resilience (Accenture, 2018; Allensworth & Schuster, 2019; Crossett, 2019; Hershey, Daniel, & Miller, 2019; Ross, Pillitteri, Graubart, Bodeau, & Mcquaid, 2019; Standard & Hutton, 2017). This study extends current literature by assessing the effect of simulation-based training (SBT) on cyber resiliency. The purpose of this study was to determine if SBT, where operators received hands-on simulations of various cyber effects, could show measurable improvement in overall cyber resiliency. Participants completed a 20-minute mission using an Air Traffic Control (ATC) simulator during which an unexpected cyber-attack was launched. All participants received the same user training, mission scenario, technical manual, and Incident Response Plan (IRP), but only the Treatment Group also received a half hour of simulated cyber effects where they practiced following the IRP to recover. Of the 21-person sample participating in the experiment and a 5% significance value, the Treatment Group showed statistically significant improvements in mission performance, cyber resiliency metrics, and lower psychological factors including distress and worry. Keywords: Cyber Resilience, Cybersecurity, Operational Resilience, Simulation-based Training (SBT), Cyber Security Work Force (CSWF). [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]