I don't know, but I can speak from experience as a former enlisted soldier in a deployed military intelligence section of the US Army: 95%+ of the "secret" stuff I had access to wouldn't even have been of great interest to the local insurgents, to be honest. The line soldiers going out on mission everyday openly talked in chow halls about their mission schedules and things that would have been far more interesting to the insurgents than what I had on my computer.
Now granted, the mission plans would have been pretty interesting to the other team (I almost wrote the word enemy, but I don't believe that to be accurate, but that's irrelevant to this post), but those were printed out and ended up laying around on desks, all the platoon leaders / platoon sergeants had them, and despite best efforts to keep track of that stuff it is never 100%.
Granted, Chelsea may have had WAY more access than I did, I'm not trying to speak about things I have no facts regarding. I am trying to say that I find it VERY hard to believe that an E-4 intel soldier (or even most O-6's, to be honest) would have access to anything that could compromise field intelligence activities or actionable information about the goings on with special forces teams. The overwhelming majority of the information we had on SIPR (basically the 'secret' internet for USG, the computers with red cables coming out of them) relevant to the local theater of operations was an insanely disorganized mess of reports following missions, almost none of which had anything juicy in them.
Having become a software engineer and math guy after getting out of the service, looking back on the "information" available to US and allied commanders in Afghanistan I'm 100% certain that my current boss would fire me for delivering such a mess.
EDIT Looked up Manning's unit level:
Full Disclosure: Chelsea Manning worked in a Brigade level S-2 (intel section), and I was only at Battalion, so she definitely had better systems / access than I did. I still doubt she could find out what Jason Bourne was up to.
Because it is equally important that the us invasion be seen for what it is, as it was for nsa to be seen for what it is. Collateral murder itself was probably big enough to warrant the risk to us spies
I never understood why Snowden and Manning are put on equal footing in that regard.