Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11 [December 8, 2014] [open pdf - 1MB]
"Since the terrorist attacks of September 11, 2001, the U.S. Armed Forces, under guidance from the Department of Defense (DOD), have conducted the following military operations:  Operation Enduring Freedom (OEF) in Afghanistan and other small Global War on Terror (GWOT) operations like the Philippines and Djibouti that began immediately after the 9/11 attacks and continue;  Operation Iraqi Freedom (OIF) that began in the fall of 2002 with the buildup of troops for the March 2003 invasion of Iraq and continued with counter-insurgency and stability operations until 2010;  Operation New Dawn (OND), a successor to OIF that began on September 1, 2010, when U.S. troops adopted an advisory and assistance role and concluded in December 2011 when all U.S. troops withdrew from Iraq (though some 13,000 combat-ready troops remain in Kuwait);  Operation Noble Eagle (ONE) providing enhanced security for U.S. military bases and other homeland security that was launched in response to the attacks and continues at a modest level; and  Operation Inherent Resolve (OIR), authorized by the President on August 7, 2014, beginning with DOD air strikes in Iraq and Syria to 'degrade and ultimately defeat' the Islamic State (IS) without deploying U.S. ground troops. On May 27, 2014, President Obama's announced that the number of U.S. troops in Afghanistan would decrease from 33,000 to 9,800 by January 1, 2015; would halve again by January 1, 2016, to about 4,900; and be limited to an embassy presence of about 1,000 thereafter.1 Some unspecified number of the 60,000 U.S. troops currently providing in-theater support would remain in the region as an 'enduring presence' after the withdrawal of troops from Afghanistan."
CRS Report for Congress, RL33110
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html