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Contract Special Security Officer (CSSO)

Seneca Holdings
Charleston, SC Contractor
POSTED ON 9/9/2026
AVAILABLE BEFORE 3/7/2027

Great Hill Solutions, LLC is part of the Seneca Nation Group (SNG) portfolio of companies. SNG is Seneca Holdings' federal government contracting business that meets mission-critical needs of federal civilian, defense, and intelligence community customers. Our portfolio comprises multiple subsidiaries that participate in the Small Business Administration 8(a) program. To learn more about SNG, visit the website and follow us on LinkedIn.

Our team of talented individuals is what makes us successful. To support our team, we provide a balanced mix of benefits and programs. Your total rewards package includes competitive pay, benefits, and perks, flexible work-life balance, professional development opportunities, and performance and recognition programs. We offer a comprehensive benefits package that includes medical, dental, vision, life, and disability, voluntary benefit programs (critical illness, hospital, and accident), health savings and flexible spending accounts, and retirement 401K plan. One of our fundamental principles is to offer competitive health and welfare benefits to our team members, providing coverage and care for you and your family. Full-time employees working at least 30 hours a week on a regular basis are eligible to participate in our benefits and paid leave programs. We pride ourselves on our collaborative work environment and culture, which embraces our mission of providing financial and non-financial benefits back to the members of the Seneca Nation.

 

Great Hill Solutions is seeking a Contract Special Security Officer (CSSO) to support the National Cyber Range Complex (NCRC). The CSSO will manage and execute day-to-day Sensitive Compartmented Information (SCI) security support and serve as a primary contractor point of contact for SCI security matters. The position is responsible for supporting personnel, information, administrative, industrial, and physical security requirements; maintaining SCIF security and classified-material accountability; coordinating SCI access actions; and ensuring compliance with applicable Government security policies and procedures. This is an on-site position in Charleston, SC.

Roles and Responsibilities include, but are not limited to:

  • Coordinate with Government security personnel on SCI personnel, information, administrative, industrial, and physical security matters.
  • Process requests to add cleared personnel to the program, coordinate SCI access, and prepare, submit, and track Visit Authorization Requests (VARs).
  • Schedule and coordinate SCI indoctrinations, debriefings, and Transfers-in-Status, and ensure personnel meet clearance, access, and need-to-know requirements.
  • Maintain SCIF access rosters and visitor registers for cleared and uncleared personnel.
  • Maintain classified material receipt, transfer, and accountability records, including documentation for material entering or leaving the SCIF.
  • Conduct required inventories of classified holdings, oversee approved destruction of SCI material, and maintain associated accountability and destruction records.
  • Prepare courier order requests and support compliance with classified-material transportation requirements.
  • Conduct annual security self-inspections, periodic interior/exterior SCIF inspections, alarm-response testing, and required entry/exit inspections.
  • Control introduction of electronic devices and other equipment into the SCIF and coordinate proposed structural or physical changes with Government security personnel.
  • Conduct or coordinate defensive security briefings and awareness activities, and forward required foreign travel and foreign contact reports to the Government SSO.
  • Review public-release materials, speeches, DD Form 254s, corporate publicity, and similar information; maintain the Program Security Classification Guide; and support proper classification and handling.
  • Report suspected or actual loss, compromise, unauthorized disclosure, espionage, sabotage, subversive activity, or other reportable security incidents.
  • Notify the Government of CSSO personnel changes, support continuity of security operations, and respond to after-hours security-related calls.
  • Support contract closeout, including 100-percent inventory, authorized retention, return, transfer, or destruction of classified holdings, personnel debriefings or Transfers-in-Status, and final accountability.

Basic Qualifications:

  • Active Top Secret security clearance with SCI eligibility.
  • Meaningful SCI security experience in the DoD/IC, including work in an accredited SCIF.
  • Working knowledge of SCI personnel, information, and physical security, including DoDM 5105.21, applicable ICD/ICS requirements, and current SCIF accreditation and physical security specifications.
  • Ability to operate independently with Government security personnel.

Desired Skills:

  • Prior experience as a CSSO, ACSSO, SSO, Assistant SSO, or equivalent SCI security professional supporting DoD classified programs in an accredited SCIF.
  • Experience processing personnel access actions, VARs, SCI indoctrinations/debriefings, and related security documentation.
  • Experience with classified-material accountability, inventories, receipt and transfer procedures, and secure destruction.
  • Knowledge of SCIF access control, visitor management, physical security, electronic-device controls, and alarm-system programming for SCI-cleared personnel.
  • Experience conducting security self-inspections, supporting Government inspections, managing corrective actions, and reporting incidents, deficiencies, or potential compromises.
  • Experience supporting classified contract transition or closeout and writing security SOPs.
  • Experience using DISS and SIMS.
  • Availability for after-hours security-related calls.
  • Strong organizational, communication, and documentation skills.

Equal Opportunity Statement:
Seneca Holdings provides equal employment opportunities to all employees and applicants without regard to race, color, religion, sex/gender, sexual orientation, national origin, age, disability, marital status, genetic information and/or predisposing genetic characteristics, victim of domestic violence status, veteran status, or other protected class status. This policy applies to all terms and conditions of employment, including, but not limited to, hiring, placement, promotion, termination, layoff, recall, transfer, leave of absence, compensation and training. The Company also prohibits retaliation against any employee who exercises his or her rights under applicable anti-discrimination laws. Notwithstanding the foregoing, the Company does give hiring preference to Seneca or Native individuals. Veterans with expertise in these areas are highly encouraged to apply.
 

 

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