Sigma Defense

Software-driven CJADC2 and C5ISR systems

Information System Security Officer

Security Governance, Risk & ComplianceConfirmed live in the last 24 hours

Full-timeMarch Air Reserve Base, CA, USA

About the Job

Requirements

Three to seven years of relevant experience.
Experience in information assurance, cybersecurity, or Risk Management Framework activities.
Familiarity with NIST SP 800-53 security controls and DISA Security Technical Implementation Guides.
Experience supporting vulnerability management and cybersecurity compliance activities.
Experience supporting Assessment and Authorization activities.
Experience maintaining Risk Management Framework documentation and security artifacts.
Familiarity with ACAS, STIG Viewer, and SCAP Compliance Checker.
Understanding of Controlled Unclassified Information requirements and handling procedures.
Experience supporting secure or air-gapped Department of Defense environments.
Experience supporting Cross Domain Solution technologies.
Experience with Full Motion Video systems, platforms, or supporting infrastructure.
Experience supporting vulnerability management, security compliance, or incident response activities.
Experience working collaboratively with Information System Security Managers, system administrators, and network engineers.
Must be a U.S. citizen.
CompTIA Security+ certification is required.
Must possess or be able to obtain an active Top Secret/Sensitive Compartmented Information security clearance or higher.
A bachelor's degree from an accredited college or university in Cybersecurity or a related field of study.

Responsibilities

Perform routine vulnerability assessments using ACAS and coordinate remediation efforts with engineering staff.
Review, document, and verify DISA Security Technical Implementation Guide compliance for Windows, Red Hat Enterprise Linux, and supporting infrastructure.
Develop, maintain, and track Plans of Action and Milestones.
Support continuous monitoring activities and maintain the overall cybersecurity posture of assigned systems.
Review system changes to identify cybersecurity impacts and ensure required documentation remains current.
Coordinate with system administrators and network engineers to maintain secure and compliant system baselines.
Support secure Cross Domain Solution operations and associated cybersecurity activities.
Prepare and provide cybersecurity documentation, reports, and status updates for government stakeholders.
Develop and maintain cybersecurity procedures, standard operating procedures, and supporting technical documentation.
Assist with cybersecurity audits, inspections, and compliance reviews.

Desired Qualifications

SSCP certification is preferred.
CISSP certification is preferred.

1772 - Information System Security Officer

Sigma Defense · March Air Reserve Base, United States · Full-time · Posted 2026-10-27

Salary: USD 118,000–138,000

Workplace: on_site

Department: SIS (SDSAFP, SDSAP)

Description

Sigma Defense is seeking an Information System Security Officer to join our team at March Air Reserve Base. This position plays a key role in maintaining the cybersecurity posture of secure Department of War information systems through Risk Management Framework (RMF) activities, continuous monitoring, vulnerability management, and system certification efforts. The ISSO is responsible for maintaining RMF documentation and cybersecurity artifacts while supporting Assessment and Authorization (A&A) activities and ensuring systems remain secure and compliant throughout their lifecycle.

Equal Opportunity Employer/Veterans/Disabled: Sigma Defense Systems is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

Requirements

3-7 years of relevant experience.
Information assurance IA/Cyber Security or Risk Management Framework (RMF) experience.
Familiarity with NIST SP 800-53 security controls and DISA Security Technical Implementation Guides (STIGs).
Experience supporting vulnerability management and cybersecurity compliance activities.
Experience supporting A&A activities.
Experience maintaining RMF documentation and security artifacts.
Familiarity with ACAS, STIG Viewer, and SCAP Compliance Checker.
Understanding of Controlled Unclassified Information (CUI) requirements and handling procedures.
Experience supporting secure or air-gapped Department of Defense environments.
Experience supporting Cross Domain Solution (CDS) technologies.
Experience with Full Motion Video (FMV) systems, platforms, or supporting infrastructure.
Experience supporting vulnerability management, security compliance, or incident response activities.
Experience working collaboratively with ISSMs, system administrators, and network engineers.
Must be a U.S. citizen.

Mandatory Certifications:

CompTIA Security+ is required.
SSCP is preferred.
CISSP is preferred.

Computer Programs/Software:

Familiarity with ACAS, STIG Viewer, and SCAP Compliance Checker.

Personnel Clearance Level:

Candidate must possess or have the ability to obtain an active TS/SCI security clearance or higher.
Clearance may be sponsored for the right candidate.

Education Requirements:

Bachelor's degree from an accredited college or university in a Cybersecurity or related field of study.

Essential Job Duties (not all-inclusive):

Perform routine vulnerability assessments using ACAS and coordinate remediation efforts with engineering staff.
Review, document, and verify DISA STIG compliance for Windows, Red Hat Enterprise Linux, and supporting infrastructure.
Develop, maintain, and track Plans of Action and Milestones (POA&Ms).
Support continuous monitoring activities and maintain the overall cybersecurity posture of assigned systems.
Review system changes to identify cybersecurity impacts and ensure required documentation remains current.
Coordinate with system administrators and network engineers to maintain secure and compliant system baselines.
Support secure CDS operations and associated cybersecurity activities.
Prepare and provide cybersecurity documentation, reports, and status updates for government stakeholders.
Develop and maintain cybersecurity procedures, standard operating procedures, and supporting technical documentation.
Assist with cybersecurity audits, inspections, and compliance reviews.

Salary Range: $118,000 - $138,000 annually.

Benefits

Dental and Vision Insurance
Medical Insurance to Include HSA, FSA, and DFSA Plans
Life and AD&D coverage
Employee Assistance Program (EAP)
401(k) Plan with Company Matching Contributions
160 Hours of Paid Time Off (PTO)
12 (Floating) Holidays
Educational Assistance
Highly Competitive Salary

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About the Company

Sigma Defense

Software-driven CJADC2 and C5ISR systems

Sigma Defense provides software-driven solutions that improve military communications and decision-making. It specializes in integrating advanced technologies, data analytics, and communication networks to create interoperable systems that share real-time information across all military services and agencies. Its CJADC2 focus means it bridges legacy systems with modern technology to speed access to data and enhance decision-making through sensor analysis and strong network security. The portfolio includes C5ISR, SATCOM, and DevSecOps, and features a Tactical Relay System (a U.S. Government Program of Record) that transports and distributes tactical ISR data. The company uses DevSecOps to enable rapid, secure deployment of capabilities to front-line users, with a team of veterans and technologists developing hardware and software solutions to improve decision quality, speed, and certainty in military operations.

Company size: 51-200
Company stage: Not listed
Total funding: Not listed
Headquarters: Warner Robins, GA
Founded: 2006

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