The main war profiteers in Iraq and Afghanistan?

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Let's see:
power generation rebuilding contracts:
$603 million to Flour-Amec
$611 million to Washington International
$566 million to Perini Corp.

water system reconstruction contracts:
$600 million to Washington Intl / Black & Veatch
$1.1 billion to Fluor-Amec

oil construction contracts:
$7 billion Kellogg, Brown and Root (Halliburton)
$425 million Parsons-Worley

Central Command Capacity contracts:
$500 million CH2M Hill etc.
$500 million KBR
$500 million Fluor
$500 million Parsons
$500 million Shaw
$500 million Odebrecht-Austin
$500 million AIC-Syska-Hennesy-Archidon
$500 million Washington Intl-Black&Veatch
$500 million Perini
$500 million Contrak

And now we're on to the USAID contracts:
$1.8 billion Bechtel - Parsons
$680 million Bechtel

Those are just the large contracts; there are many, many more. Take private security for example:
$293 million Aegis
$48 million Vinnell
$11 million Blackwater