The media impact of the presence of military contractors in war zones had its heyday during the war in Iraq. Its main jobs are to provide security to VIP security personnel and some military bases.
In the Vietnam War 18% of the troops were contractors, on the other hand in the Korean War 28% of all troops were contractors. In World War II the total percentage was 12%.
But not only use United States contractors in Iraq and Afghanistan many other countries used them.
The US military since 1960 are hiring more staff this. It is not given much publicity to these facts because such as medical personnel are hired, charges more than military personnel.
These facts are doing to increase the number of courses to prepare civilian personnel for combat zones, as seen in this video: