The Department of Defense has implemented the Standard Desktop Configuration (SDC) environment which allow all systems to have a uniform level of security.Â
ALL SDC all the time: https://afecmo.gunter.af.mil/default.aspx
Now the rest of the federal goverment is jumping on the Information Assurance Bandwagon with something called the Federal Desktop Core Configuration (FDCC).
SDC version 2 (Vista) is already in the works as well as Standard Server Configuration (SCC).