Well, the article did state: "The US D.O.D. currently has about 470,000 BlackBerrys in use across its networks, with 41,000 Apple mobile devices and...
Personally I like having the option and ability to load apps from outside the official app catalogues. That being said, if the walled garden is well...
Blackberry is still king is U.S. Government circles and many of those people don't have the time to learn a new device or OS and thus, will continue...