Apparently so according to Stay Strong Nation.
"The scariest part of PTS is when a veteran experiences symptoms such as flashbacks, or feelings of panic and depression, yet unknowingly brushes it under a blanket of machismo. Veterans either play or have exposure to the games and subsequently feel like they're back in Afghanistan or Iraq in life or death situations. Their heart beat accelerates and they feel a sense of unease come over them."
Gresford Lewishall VP of SSN.
Stay Strong Nation does not want to demonize the game they are just attempting to warn veterans returning home that the game can cause some strong feelings.