<Li> General Services Administration ($17.6 bn) </Li> <Li> NASA ($16.0 bn). </Li> <P> The Top 100 Contractors Report for Fiscal Year 2009 lists contracts totalling $294.6 billion, the top five comprising aerospace and defense contractors: </P> <Ul> <Li> Lockheed Martin ($38.5 bn) </Li> <Li> Boeing ($22.0 bn) </Li> <Li> Northrop Grumman ($19.7 bn) </Li> <Li> General Dynamics ($16.4 bn) </Li> <Li> Raytheon ($16.1 bn) </Li> </Ul>

Which of the following is not an example of the government acting as a source of payment