I'm ex-military and now work as a contractor. My biggest problem is that I can't take my iPad into all areas I work, which sucks because I use it as a doc repository for documentation I reference frequently (IT stuff). It's a great resource, and I can see how it would be useful on deployments and in the infrastructure if I was still active. Sadly, until Apple develops the corporate features that Windows and Blackberry devices have (remote policy and patching, centralized authentication and control, encryption, etc), it won't catch on in these types of environments.
Apple develops for the home user and does a great job of it, they intentionally don't compete in the corp/gov't markets since they would not be dominant.