Ian Traynor, The Guardian
It is a trend that has been growing worldwide since the end of the cold war, a booming business which entails replacing soldiers wherever possible with highly paid civilians and hired guns not subject to standard military disciplinary procedures.
"There's an explosion of these companies attracting our servicemen financially," said Rear Admiral Hugh Edleston, a Royal Navy officer who is just completing three years as chief military adviser to the international administration running Bosnia.
He said that outside agencies were sometimes better placed to provide training and resources. "But you should never mix serving military with security operations. You need to be absolutely clear on the division between the military and the paramilitary."
"If these things weren't privatised, uniformed men would have to do it and that draws down your strength," said another senior retired officer engaged in the private sector. But he warned: "There is a slight risk that things can get out of hand and these companies become small armies themselves."
And in Baghdad or Bogota, Kabul or Tuzla, there are armed company employees effectively licensed to kill. On the job, say guarding a peacekeepers' compound in Tuzla, the civilian employees are subject to the same rules of engagement as foreign troops.
But if an American GI draws and uses his weapon in an off-duty bar brawl, he will be subject to the US judicial military code. If an American guard employed by the US company ITT in Tuzla does the same, he answers to Bosnian law. By definition these companies are frequently operating in "failed states" where national law is notional. The risk is the employees can literally get away with murder.
Or lesser, but appalling crimes. Dyncorp, for example, a Pentagon favourite, has the contract worth tens of millions of dollars to train an Iraqi police force. It also won the contracts to train the Bosnian police and was implicated in a grim sex slavery scandal, with its employees accused of rape and the buying and selling of girls as young as 12. A number of employees were fired, but never prosecuted. The only court cases to result involved the two whistleblowers who exposed the episode and were sacked.
"Dyncorp should never have been awarded the Iraqi police contract," said Madeleine Rees, the chief UN human rights officer in Sarajevo.
Of the two court cases, one US police officer working for Dyncorp in Bosnia, Kathryn Bolkovac, won her suit for wrongful dismissal. The other involving a mechanic, Ben Johnston, was settled out of court. Mr Johnston's suit against Dyncorp charged that he "witnessed co-workers and supervisors literally buying and selling women for their own personal enjoyment, and employees would brag about the various ages and talents of the individual slaves they had purchased."
There are other formidable problems surfacing in what is uncharted territory - issues of loyalty, accountability, ideology, and national interest. By definition, a private military company is in Iraq or Bosnia not to pursue US, UN, or EU policy, but to make money.
The growing clout of the military services corporations raises questions about an insidious, longer-term impact on governments' planning, strategy and decision-taking.
Mr Singer argues that for the first time in the history of the modern nation state, governments are surrendering one of the essential and defining attributes of statehood, the state's monopoly on the legitimate use of force.
But for those on the receiving end, there seems scant alternative.
The Privatisation of War, Ian Traynor, The Guardian
Apartheid Enforcers Guard Iraq For the U.S., Marc Perelman, Forward
U.S. gives $400M in work to contractor with ties to Pentagon favorite on Iraqi Governing Council, Knut Royce, Newsday
British Commanders Condemn US Military Tactics, Sean Rayment, Telegragh
Slain Contractors Were in Iraq Working Security Detail, Dana Priest, Mary Pat Flaherty, Jackie Spinner, Washington Post
Our Troops and Theirs, Suvrat Raju, ZNet | Iraq