It looks like you didn't read the article very closely. The current cost of war is between $1.3 trillion and $2.7 trillion.
Quote:
Specific war spending over the past 10 years, when expressed in 2011 dollars, comes to $1.3 trillion, the "Costs of War" project found....
In the 10 years since U.S. troops went into Afghanistan to root out the al Qaeda leaders behind the September 11, 2001, attacks, spending on the conflicts totaled $2.3 trillion to $2.7 trillion.
The $3.7 trillion is the total cost (including future expenses like veteran's aid, interest, etc)
Quote:
The final bill will run at least $3.7 trillion and could reach as high as $4.4 trillion, according to the research project "Costs of War" by Brown University's Watson Institute for International Studies.
I'm not disputing that it is an enormous sum, just that you headline is misleading.