Private military firms or Mercenaries, whatever you may wish to call them are they really the best alternative to United Nation peacekeeping forces? well, the answer may vary depending on your level of ethical literacy if you know what I mean, although it might seem like a simple task, no one as yet been able to come up with the right answer to that question, the debate is interesting and quite wide that being said, it is important to note that private armies as I would call it lack the legal personality that would legitimize their true cause in war or conflict. 
According to security industry specialist, international security has become a $100 billion industry annually; this therefore translates to a profitable venture for private military firms for example Black Water LLC now known as Xe Services LLC, a private military firm in the US was awarded $1 billion contract by the united states government to consult, support marines in Iraq and Afghanistan as well as train Iraqi police force.
Private armies are commercial organizations that deal in professional services complexly connected to combat. They specialize in military skills capacities to war explosive and mine detection and various other roles for warfare and law enforcement duties including calculated warfare operations, covert and intelligence analysis, operational support, forces training, and armed technological assistance etc
The emergence of private armies is directly correlated to an ideological construct meaning that change from traditional thinking of military to a more commercial modernization of security is more present than before. Capitalism as an ideological construct change the thinking from public to privatization this therefore was more efficient or profitable to run military sector as a commercial venture.
Entrepreneurship is another factor that led to private armies establishment, entrepreneurs created digital and complex information systems that surpassed the old and outdated military systems, this therefore made the private entrepreneurs more sophisticated and advanced than their public colleagues and led to a realization of partnership between the two.
Private armies have had a serious public relations nightmare whereby they have time and time again being branded as mercenaries or dogs of war as the media calls them, their role in war torn states such as Iraq, Ivory Coast, Somalia, Chad and Libya, their efforts have been successful but not a clean job, they have been accused by the people of war crimes: assault, human rights abuses, rape, destruction of property, genocide, ethnic cleansing and all manner of ills the society has, many of this private armies have been used by big and small states as proxies to impose their political and economical interest, so as to avoid the spike of the international laws that limit their direct involvement for example the United States of America and the United Kingdom have been known culprits who have used private armies to advance their deep dark secrets to loot oil reserves and diamonds in the name of democracy and violation of human rights all in all this is subject to a wide debate that requires a mature and objective discussion of which this post isn’t part of.
A positive side of this private armies was in the civil war in Sierra Leone, in which the rebels of the Revolutionary United Front was in the middle of an orgy of looting, murder and decapitation, a private firm Executive Outcomes defeated them with only a force of 300 men and was able to establish democratic elections in Sierra Leone. This success could be compared to the United Nations peacekeeping force in Sierra Leone who used billions and billions of dollars in 3 years to maintain a ceasefire between the Revolutionary United front and the government while Executive Outcomes used less than that amount in 6 months to defeat the rebels and set up government with no known casualties.
All that sounds like a scene from an American movie, but reality bites private armies are not going anywhere because of their “legal” advantage they provide for powerful states that can afford them or for outdated and undertrained military states in developing states, but mainly they come in handy as a foreign policy tools. Private firms such as Executive Outcomes attested how valuable they could do when only a force of 300 men was able to accomplish in Sierra Leone what 18,000 United Nations men couldn’t.
The ethical dilemma of addressing what to do about private armies is confusing, the difficulty to calculate the cost benefit analysis is invaluable but those who fight for financial gain are an stumbling block to much of what we strive for honor.