[Page under construction - I have them. I just haven't organized them here yet.]
Tolerance for Change: Government projects have strict requirements, budget, and scope specified at the outset while Agile is about being adaptive to change.
Team Culture: Internally it might be a bigger challenge since it affects the culture of the team. Is your team ready to work together in a collaborative way?
Organizational Culture: A rigid hierarchy of decision-making may make it difficult to keep an evolving project moving along according to schedule.
Stakeholder Availability and Engagement: Stakeholders may only be able to offer input during the initial planning of the project.