What are the major similarites between private military firms and mercenaries?

I know there pretty much the same thing and i have they they both want money and are not part of the regular military, but what else is there?What are the major similarites between private military firms and mercenaries?The amount of loyalty they owe to the government. Mercenaries rant forced to work but hired.What are the major similarites between private military firms and mercenaries?
A private military company (PMC) provides specialised expertise or services of a military nature, sometimes called or classified as mercenary ("soldiers for hire").



http://www.search.com/reference/Private_鈥?/a>What are the major similarites between private military firms and mercenaries?military contractors can be hired to protect VIPs mercenaries are hired to kill people

and both can be prosecuted after warWhat are the major similarites between private military firms and mercenaries?
Same scummy murderous thugs. Just a "rebranding" to sound more palatable.What are the major similarites between private military firms and mercenaries?Both of them end a human life with a bullet in head or chest. No matter how much they try but they won't get peace with a gun in hand.