[mcguire]

Yes. Mostly.

The contracts are generally for specific products or services, for a specific time. High-level agencies have a great deal of autonomy and also get to pull their needs out of their own budgets. Lower-level elements within an agency (a NASA center, for example) can also have more or less autonomy.

[remarkEon]

Yeah I shouldn't been more clear in my question. I was more referring to high-level services (e.g. Office). For specific use-cases, it makes sense for lower level agencies to have at least a little autonomy.