In 2006, soon after returning from military service in Ramadi, Iraq, during the bloodiest period of the war, Captain Matt Stevens of the Vermont National Guard began to have a problem with PTSD, or post-traumatic stress disorder. Stevens's problem was not that he had PTSD. It was that he began to have doubts about PTSD: the condition was real enough, but as a diagnosis he saw it being wildly, even dangerously, overextended.
Stevens led the medics tending an armored brigade of 800 soldiers, and his team patched together GIs and Iraqi citizens almost every day. He saw horrific things. Once home, he said he had his share of "nights where I'd wake up and it would be clear I wasn't going to sleep again."