Here is an excerpt from "America's Medicated Army":
Nearly 30% of troops on their third deployment suffer from serious mental-health problems, a top Army psychiatrist told Congress in March. The doctor, Colonel Charles Hoge, added that recent research has shown the current 12 months between combat tours "is insufficient time" for soldiers "to reset" and recover from the stress of a combat tour before heading back to war.
Many are going on their third tour now... some their fourth and fifth. Add this to understrength units deploying, troops suffering from PTSD and anxiety disorders being medicated to continue to deploy, 3,000 captains leaving the Army, and a lack of field grade leadership seems to indicate an Army in crisis.