Generate text that refutes this claim: PMCs are a valuable resource  PMCs are a flexible and efficient tool with which to fight 21st Century wars making them a necessity. Private contractors can be hired at short notice and used only when necessary. They can be used to carry out specific missions, to reinforce traditional troops where greater numbers are required or to protect other contractors whilst traditional troops carry out more lucrative missions. Additionally, most PMCs are non-combative but rather defensive, providing security for officials, supply trains etc. As a result they are viewed less as invaders or “the enemy” and more as peace-keepers.
defence house would employ mercenaries
PMCs are ineffective as they do not fit in with a disciplined army. PMCs are not bound by the same rules and standards of conduct and accountability as conventional troops. When problems arise it is often unclear whether army representatives or PMCs should be held responsible. Moreover, the lack of regulation means that there is no means to ensure mercenaries breaking laws are disciplined. Currently most mercenaries can operate outside martial law with relative freedom. Some of the worst offences at Abu Ghraib prison in Iraq were committed by “privatised interrogators” (Hersh, 2004) who are yet to be punished.