Personally... I think any large organization or government needs to demand the source code to almost any system they buy or otherwise use. Whether that's open source via GPL or BSD style licences, or licensed from a proprietary vendor, the organization needs to have access to the source code itself so that it can customize the software to their own needs, and/or continue to maintain the product after it is no longer supported by the vendor/developer.
And what about IP ownership and trade secrets? Does that fly out the window because you want the source code?
Sure demand it, but I dont think companies should be required to give it up. If you want to keep the source closed its an IP owners right. If open source means so much to your org, then go and find someone who will release the source.