For 10 points, name these companies that are often used to escort VIP's in war zones, and whose most famous example was known as Blackwater Worldwide.
Trott Lott's attempt to exempt one of these groups from the Leahy Provision is detailed in a chapter of Generation Kill, and that group was at center of conflict in Plan Colombia. Due to involvement with one of these groups, Julius Chan was ousted as Prime Minister of Papua New Guinea. In addition to that example of these groups named Sandline, another of these groups was founded by Eric Prince and was investigated after the death of Scott Helvenston. After killing seventeen civilians in Nisoor Square, that group changed their name to Xe Services, and some of their employees were notably ambushed in Fallujah. For 10 points, name these companies that are often used to escort VIP's in war zones, and whose most famous example was known as Blackwater Worldwide.
Trott Lott's attempt to exempt one of these groups from the Leahy Provision is detailed in a chapter of Generation Kill, and that group was at center of conflict in Plan Colombia.
Private Military Companies [prompt on "mercenaries" or equivalents]