The answer to that question is simple!  War preparations are big business.  It involves billions in air defense.

Take Boeing's $40 billion air tanker aircraft, allowing the aircraft tanker to refuel in the air.  When the $40 billion contract went to a French company located in Toulouse, France, the Seattle based Boeing Company was outraged and demanded congressional hearings.  

Then there are two big war business giants - Halliburton and Bechtel.  Halliburton benefited in the Iraq War debacle to the tune of billions of dollars.  Cheney, the U.S. vice president, worked for Halliburton at one time and his services provided millions for his bank account.  

There was some superficial debate regarding the "conflict of interest" factor when after being a Halliburton CEO, and then when he became vice president Halliburton was provided with governmental contracts benefited by no-bid contractual deals, to show the company's loyalty to big bucks instead of the U.S.A.  The Halliburton Company fled to Darfur to cut their U.S. tax obligations.