David E. Mosher, assistant director for national security, Congressional Budget Office. Testimony before the Committee on the Budget, U.S. House of Representatives, 7 July 2011.
http://www.cbo.gov/ftpdocs/121xx/doc12162/07-07-FYDP_Testimony.pdf

Congressional Budget Office, 26 January 2010.
http://www.cbo.gov/ftpdocs/108xx/doc10871/01-26-Outlook.pdf

Moshe Schwartz. Congressional Research Service, 14 December 2009.
http://www.scribd.com/doc/24124212/CRS-Contractors-Study-12-09

Roxana Tiron. The Hill, 18 November 2009.
http://thehill.com/business-a-lobbying/68515-pentagon-budget-drop-anticipated

Excerpt:

CBO also projects that carrying out the Pentagon’s plans in its 2010 budget request — excluding overseas contingency operations in Afghanistan, Iraq and elsewhere — would require defense resources averaging $567 billion annually (in constant 2010 dollars) from 2011 to 2028. That amount is about 6 percent more than the $534 billion the Obama administration requested for the 2010 budget, excluding overseas contingency funds, according to Goldberg.

Reasons why more resources would be required in the long run include the likelihood of growing military pay and benefits; a projected increase in the cost of operating and maintaining aging equipment as well as newer and more complex systems; plans to develop advanced weapons systems to replace aging ones; and investments in advanced intelligence, surveillance and reconnaissance systems to meet emerging security threats.

Matthew S. Goldberg. testimony before Committee on the Budget, U.S. House of Representatives, Congressional Budget Office, 14 October 2009.
http://cbo.gov/ftpdocs/106xx/doc10633/10-14-DoD_2010_HBC_Testimony.pdf

Statement of Stephen Daggett, Specialist in Defense Policy and Budgets, Congressional Research Service, before the House Committee on the Budget, 14 October 2009.
http://www.gpo.gov/fdsys/pkg/CHRG-111hhrg53004/pdf/CHRG-111hhrg53004.pdf

One common criticism of the “capabilities based” analysis of the 2001 and 2006 QDRs, even as they
helped to broaden awareness of the range of threats, is that the analytical framework did not help much in
allocating resources away from some areas and into others. Leaving aside whether such criticism is fair,
the current Administration has emphasized the need to analyze specific threats in order to establish
priorities. The question that follows is, how boldly will the current QDR address the potential need for
major changes in forces in view of its assessment of new challenges?

CBO, 07 October 2009.
http://www.cbo.gov/ftpdocs/105xx/doc10523/10-07-TierneyTroopWithdrawal.pdf

CBO Director’s Blog, 07 August 2009.

Excerpt:

CBO estimates that if the Social Security payroll tax rate was increased immediately and permanently by 1.3 percentage points—from the current rate of 12.4 percent to 13.7 percent—the trust funds’ balance at the end of 2083 would equal projected outlays for the subsequent year.

Andrew Feickert. Congressional Research Service, 03 August 2009.
http://www.fas.org/sgp/crs/natsec/RS21048.pdf

Ronald O’Rourke. Congressional Research Service, 09 July 2009. Posted on the Commonwealth Institute server (printable .pdf file).

Government Accountability Office, 02 July 2009. Hosted on the Inside Defense Website.
http://www.gao.gov/new.items/d09706r.pdf

Amy Belasco, Congressional Research Service, 2 July 2009 (printable .pdf file).

Amy Belasco, Congressional Research Service, 15 May 2009. Posted on the Federation of American Scientists Website.
http://www.fas.org/sgp/crs/natsec/RL33110.pdf

United States Government Accountability Office, September, 2007. Posted on the Commonwealth Institute Website (printable .pdf file).