He acted out while in the Army, obviously behaving in a way that showed his superiors that he needed help, yet they did nothing. He was even busted back down to PFC from SPC. Yet, they put him back on the job.
On top of that, he was living in the "don't ask don't tell" world of the military at the time, risking discharge for admitting that he was gay.
https://en.wikipedia.org/wiki/Bradley_Manning#Deployment_to_...