Vigilant Cyber Systems (VCS) is a cybersecurity firm with over 25 years of experience providing services to the defense and government sectors. The company specializes in three primary areas: developing innovative software solutions, conducting offensive cyber testing on cyber-physical systems, and offering consulting services to the Department of Defense (DoD) testing and evaluation community. VCS focuses on mission-critical systems and infrastructure, with a particular emphasis on cyber-physical systems — environments where digital and physical components intersect, such as defense platforms and naval systems. Their offensive cyber testing work involves detailed assessments across the full spectrum of cyber systems, indicating a red team or penetration testing oriented capability. The company's consulting practice is directed at the DoD testing and evaluation community, suggesting they support government programs in assessing and validating cybersecurity posture for defense-related systems. Their team includes specialists with hands-on experience in executing these assessments, and they actively recruit naval consultants, software engineers, and cyber testing professionals. VCS maintains a small, specialized workforce model and recruits through programs like Skillbridge, which connects transitioning military personnel with private sector opportunities. The company serves what it describes as the world's most discerning customers, reflecting a focus on high-assurance, defense-oriented clientele rather than commercial enterprise markets.