U.S. troop levels in Iraq and Afghanistan 2001-2010
May 28, 2010
Downloadable text files: Afghanistan data, Iraq data.
Data sources: Iraq – 05/2003 through 04/2010, Iraq Index by the Brooking Institute, May 2010 issue; 05/2010, various news reports. Afghanistan – 09/2001 through 11/2008, Troop Levels in the Afghan and Iraq Wars by Amy Belasco, Congressional Research Service; 12/2008 through 11/2009, Troop Levels in Afghanistan Since 2001 by the New York Times; 12/2009 through 04/2010, read from Figure 1.13 of Afghanistan Index by the Brookings Institute, May 2010 issue; 05/2010, various news reports.
Updated to show data through Nov. 2010.
Pro Bono Statistics 
June 29, 2010 at 2:25 am
The graph is not correct at this page:
https://probonostats.wordpress.com/2010/05/28/u-s-troop-levels-in-iraq-and-afghanistan-2001-2010/
June 29, 2010 at 3:05 am
I do believe the graph is correct. Note that the top line shows the total number of troops in Afghanistan + Iraq.
You are welcome to use the raw values in the data files (links in the post) to plot your own graphs, or to point out errors in the data.