David Isenberg, an arms-control analyst at DynMeridian, a consulting firm, says PMCs are often used in these borderline situations, when working through official channels is either too cumbersome or politically difficult.

• 戴维·伊森伯格是DynMeridian咨询公司的军备控制分析家。他说，当遇到官方渠道做工作受到阻碍或政治上有困难等不确定情况时，就常常使用私营军事公司。