Summary
Overview
Work History
Education
Skills
Certification
PROFESSIONAL DEVELOPMENT
Timeline
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Caleb Clark

East Helena,MT

Summary

Dedicated cybersecurity and systems administration professional with over 5 years of Department of Defense experience in securing mission-critical systems through effective patching, advanced penetration testing, system hardening, and NIST-compliant operations. Holds a Secret clearance and is pursuing 255A Warrant Officer candidacy. Expertise includes enhancing organizational security and operational resilience within dynamic, high-stakes environments. Proven track record of implementing robust security measures to protect sensitive information and infrastructure. Committed to staying ahead of emerging threats while fostering a culture of security awareness and best practices.

Overview

15
15
years of professional experience
1
1
Certification

Work History

IT Specialist Network, Sysadmin – GS-11

Montana Army National Guard
10.2020 - Current
  • Designed and maintained secure system images for 800+ devices, optimizing performance and security.
  • Built and maintained imaging server for supported systems.
  • Served as Information Systems Security Officer (ISSO) for Maintenance Support Devices, ensuring compliance with DoD standards and mitigating vulnerabilities through risk assessments.
  • Configured and secured Cisco routers, switches, and VSAT satellite systems, supporting reliable local and remote operations.
  • Administered Linux and Windows Server environments, managing tools like Active Directory, WSUS, and MEMCM.
  • Developed and delivered cybersecurity training, system training and writing manuals/ how-to guides for supported systems.
  • Managed virtual environments using VMware, vSphere, VirtualBox, Proxmox and Hyper-V.
  • Automated system administration tasks via Microsoft Power Automate, streamlining collaboration across SharePoint and Teams.
  • Automated processes with scripts in Python, Powershell, Batch and Bash.
  • Maintained, troubleshot and repaired Army Tactical Communication systems and Logistics IT systems.

Cyber Network Defender

Montana Army National Guard
12.2010 - Current
  • Conducted penetration testing and vulnerability assessments to enhance cybersecurity for government entities.
  • Participated in digital forensics, data retrieval, and recovery to respond to cyber incidents effectively.
  • Collaborated as part of a Pen-testing team, gaining experience in different areas of a pen-test like network scanning, enumeration, hash capturing, hash cracking, password retrieval, physical/local security, phishing etc...
  • Leveraged tools like Nessus Scanner, Metasploit, NMAP, Wireshark, burp suite, responder, hydra etc to perform comprehensive cyber vulnerability assessments.
  • Wrote scripts and tools to automate processes using Python, Bash, Batch and Powershell.

Electronics Technician/ Electronics Repair Shop Supervisor

Montana Army National Guard
07.2018 - 10.2020
  • Repaired, troubleshot and maintained tactical communication systems and electronics devices (NVG, Radios, LRAS3 etc)
  • Supervised a team of up to 12 soldiers in electronics repairs.
  • Monitored and tested equipment performance to diagnose and resolve problems.
  • Fixed circuit boards and wire harness problems using schematics, wiring diagrams, and testing instruments.
  • Troubleshot and resolved equipment failures to reduce operational disruption.
  • Reduced equipment failure rates by developing and executing preventative maintenance schedule.
  • Enhanced operational performance by updating firmware and software in electronic systems.
  • Reduced downtime for critical systems by providing timely maintenance and repair services.

Wheeled Vehicle Mechanic

Montana Army National Guard
12.2010 - 07.2018
  • Maintained, Troubleshot and repaired Army wheeled vehicles.
  • Managed team of mechanics in maintenance operations.
  • Consistently met performance metrics by completing repairs within established timeframes while maintaining high-quality workmanship standards.
  • Contributed to cost savings by accurately identifying necessary parts for repairs, minimizing waste and optimizing resource usage.
  • Repaired a wide variety of wheeled vehicles, including trucks, trailers, and specialized military equipment under tight deadlines.

Education

Bachelor of Science - Cyber Operations

University of Maryland Global Campus (UMGC)
Adelphi, MD
08-2026

Associate of Arts - General Studies

American Military University
Charles Town, WV
02.2019

Skills

  • Penetration testing expertise
  • Proficient in cybersecurity tools
  • Support for Linux and Windows systems
  • Cisco networking expertise
  • Virtualization technologies expertise
  • Scripting and automation proficiency
  • Team leadership
  • Proficient in Army communication systems
  • Quality assurance
  • Troubleshooting
  • Software implementation
  • Network administration

Certification

CompTIA Security+ (2020)

PROFESSIONAL DEVELOPMENT

  • Actively engaging in hands-on cybersecurity training through vendors like TryHackMe, and Udemy, completing modules on penetration testing, network security, SOC, Digital Forensics, and incident response.
  • In process of becoming a 255A Data Operations Warrant Officer in the MTARNG.

Timeline

IT Specialist Network, Sysadmin – GS-11

Montana Army National Guard
10.2020 - Current

Electronics Technician/ Electronics Repair Shop Supervisor

Montana Army National Guard
07.2018 - 10.2020

Cyber Network Defender

Montana Army National Guard
12.2010 - Current

Wheeled Vehicle Mechanic

Montana Army National Guard
12.2010 - 07.2018

Bachelor of Science - Cyber Operations

University of Maryland Global Campus (UMGC)

Associate of Arts - General Studies

American Military University

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