·        Logistics and Support organizations, that essentially provide services that might be mundane in other environments, including aviation, logistics and construction. This sector makes up 70-80% of the industry in personnel numbers and value;

·        Private Security Companies (PSC) that protect ‘nouns’ – people, places and things -  and carry out site and convoy protection, provide body guard servicers, threat assessments and advice. These firms peaked at about 20% of the industry during peak Iraq/Afghanistan operations, but typically make only about 5% of the industry.

·        Security Sector Reform and Development organizations that are vital for with the long term solutions for state-building, including legal and law enforcement training, reforming educational systems, military and peacekeeper training, development projects, capacity building, governmental mentoring and other similar services, this may be the fastest growing sector;

·        Industry Support Companies includes legal services, accounting, public relations, recruitment and vetting of personnel, and insurance firms.  These organizations do not typically operate in the field, but support other organizations that do.