1. 3GAO. "Comanche Program Objectives Need to Be Revised to More Achievable Levels." Report to Peter A. DeFazio on Defense Acquisition, GAO01-450. US Government Accountability Office, Washington DC, June, 2001.
2. 4CBO. "DEF-10: Cancel the Marine Corps's V-22 Aircraft Program and Buy CH-53E Helicopters." FromReducing the Deficit: Spending and Revenue Options. Congressional Budget Office, Washington DC, March, 1997.