【英文】布朗大学报告：美国20年反恐战争战争成本报告（24页）

This estimate includes the  figures  for U.S. wars in the two major war zones and many small war zones. Not including the future obligations to care for veterans through 2050 or estimated homeland security spending, the war in Afghanistan and Pakistan, which is part of the same theater of operations, cost $2.313 trillion through FY2022. The U.S. wars in Iraq and  Syria cost  $2.058 trillion  through  FY2022.8    The  post-9/11  wars and  counterterror operations in other places, such as Somalia and other parts of Africa, cost about $355 billion. (See Table 2 on p. 14 of this report). The  figures  given  here  are  a  conservative  best  estimate through  fiscal  year  2022  in current dollars. At this writing the U.S. has said it will stay in Afghanistan until August 31, 2021 to  evacuate all  American  citizens who  wish  to  leave  Afghanistan, and  many  of  the Afghans  who  worked  with  them.  

The  costs  associated  with  a  massive  airlift  effort  in Afghanistan may increase  the  FY2021  costs  of war in Afghanistan  for  the DOD and State Department.  It is unclear how recent events in Afghanistan will affect  the FY2022 budget requests for DOD and State.The numbers and occasionally categories are revised in the Costs of War estimates by this author when the U.S. government provides more precise, corrected, or comprehensive information.9 For example, this report relies on updated DOD spending data. The DOD has recently,  as  discussed  below, used  the  categories of  “OCO  for  base  requirements,” and “enduring requirements,” which could apply to more than one war zone. Further, this report uses  newer  interest  rate  data  in  calculating  the  estimated  interest  on  borrowing  for emergency/overseas  contingency  operations  (OCO)  spending.10 Additionally,  this  report revises  the  estimate  of  increases  to  the  Pentagon  base  budget  given  changes  in  the Department  of  Defense’s  categories  and  patterns  of  military  spending  and  the  relations between the OCO budget and base military spending.