[jbicha]

If Manning is a volunteer, how wasn't Snowden a volunteer too?

Both signed strict non-disclosure agreements to work for the US government. Both gave up rights.

In one way, Snowden served more voluntarily than Manning did, because Snowden could quit but Manning had to fulfill the enlistment term. Had Manning walked off the job exactly like Snowden did, he could easily have been court-martialed just for that, especially as Manning was working in a war zone.