Gary Postlewait
Denton
Summary
Professional with extensive five year experience as a United States Marine Corps Sergeant. Proven expertise in risk assessment and management, complemented by exceptional team leadership skills. Adept at firearms proficiency and effective communication, consistently enhancing operational readiness and mission success through strategic training and mentorship. Skilled in diverse environments, including federal civilian employees, government contractors, and foreign nationals overseas. Demonstrated ability to perform under pressure, adapt to new surroundings, and ensure compliance with regulations and policies. Comfortable in high-stress conditions, excelling at making critical decisions during emergencies to maintain order and confidence in leadership positions.
Overview
4
4
years of professional experience
1
1
Certification
Work History
United States Marine Embassy Security Guard
United States Marine Corps
02.2022 - 06.2024
- Provided over 3,000 combined hours of armed internal security for the U.S. Embassies Guatemala City, Guatemala, Port-au-Prince, Haiti, and Brasilia, Brazil. Effectively safeguarding both classified material and embassy personnel while serving as an augment or local Marine guard. Facilitated access control and ran active security measures for all embassies, issuing Security Violations (OF-117s) and Incident Reports.
- Participated in 150 emergency drills, including intruder, bomb, internal defense, fire, safe-haven, CBRN, and natural disaster. Quick security of the chancery building in an emergency includes intruder containment, bomb searches, and other missions during exigent circumstances.
- Observed departing personnel to protect against property theft and conducted authorized removal of property within appropriate requirements.
- Watched for irregular or unusual conditions that created security concerns or safety hazards and proactively addressed concerns.
- Sounded alarms or called the police or fire department in case of fire or the presence of unauthorized persons.
- Monitored entrances and exits and warned trespassers of rule infractions while permitting authorized persons to enter the property
- Investigated and prepared reports on accidents, incidents, and suspicious activities to identify and address threats promptly.
- Led, managed, and performed force protection duties to protect personnel and resources.
- Executed timely decisions and actions based on previous experience and good judgment, sometimes revising procedures to accommodate unusual situations.
- Communicated with security team and building supervisors using two-way radios, mobile phones, and other technological devices. Secured entrances and exits by maintaining physical presence and carefully monitoring CCTV.
Infantryman Team Leader
United States Marine Corps
06.2024 - 09.2025
- Communicated effectively with superiors and subordinates alike, facilitating smooth execution of orders during high-stress situations.
- Collaborated with team members to execute strategic objectives in high-pressure environments.
- Trained junior Marines on weapon handling and tactical maneuvers enhancing overall unit readiness
- Implemented safety protocols during live-fire exercises reducing risk of accidents.
- Analyzed terrain features to inform operational planning and decision-making processes.
- Developed and executed training programs improving combat readiness and team cohesion.
- Led small unit tactics drills fostering leadership skills among peers while ensuring mission success.
- Carries, performs operator maintenance for and is a proficient marksman with the service rifle/carbine.
- Capable of performing operator maintenance for, and is proficient in employment of, all optics assigned to the rifle platoon.
- Proficient in combat reporting procedures.
- Conducted reconnaissance missions, gathering intelligence to support tactical operations.
- Operated and maintained various weapons systems ensuring optimal functionality during training and deployments.
- Developed soldier skills by providing guidance on marksmanship, physical fitness, and tactical maneuvers.
Combat Marksmanship Trainer Course Instructor
United States Marine Corps
09.2025 - Current
- Evaluated training effectiveness through feedback collection and performance reviews.
- Conducted assessments to identify knowledge gaps and tailored training sessions accordingly.
- Collaborated with leadership to align training objectives with mission requirements.
- Provided one-on-one mentoring to help individuals reach their full potential within the organization.
Education
High School Diploma -
Piedra Vista High School
Farmington, NMSkills
- Team leadership/Mentor
- Risk assessment and management
- Firearms proficiency
- First aid proficiency
- Weapons handling
- Clear and Concise Communication
- Small unit tactics
- Microsoft Office Suites
- Detailed Activity Logs
- CCTV Monitoring
- Adaptability and flexable
- Maintaining equipment
- Physical fitness
Accomplishments
- Involved in armed security as a Marine guard detachment for Secretary Anthony Blinken at the Royal Tulip Hotel in Brasilia, Brazil.
- Received a Navy and Marine Corps Achievement Medal for providing 3,220 hours of armed security and assuming a leadership role in over 75 emergency response drills in support of U.S. Embassies in Port-Au-Prince, Haiti, Guatemala City, Guatemala, and Brasilia, Brazil.
Certification
Top Secret Clearance, Active 2028-04-25
Timeline
Combat Marksmanship Trainer Course Instructor
United States Marine Corps
09.2025 - Current
Infantryman Team Leader
United States Marine Corps
06.2024 - 09.2025
United States Marine Embassy Security Guard
United States Marine Corps
02.2022 - 06.2024
High School Diploma -
Piedra Vista High School
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