SIPRNet (the secure version) has a parallel network for unclassified traffic (eg surfing foxnews / open-source intelligence / checking your gmail). If I had to

SIPRNet (the secure version) has a parallel network for unclassified traffic (eg surfing foxnews / open-source intelligence / checking your gmail). If I had to take a wild guess, an executive at some point said "why do I NEED to switch between these two terminals? Can't it all be secure on just one of them? I just want to be able to reply to outside emails on the SPIRNet." And thus it happened, or probably something like that. Never underestimate the "executive factor".