Two U.S. House subcommittees have launched a joint investigation into, quote, “an alarming pattern of recent tragedies” at Fort Hood, giving Army leadership until Oct. 2 to deliver documents related to the death or disappearance of seven soldiers, including Vanessa Guillen of Houston. In a letter sent Tuesday to the secretary of the Army, the subcommittee leaders said a spate of crimes at the Texas military post may be a symptom of leadership, discipline and morale deficiencies across the chain of command. The letter said the subcommittees will determine whether Fort Hood leaders have allowed or enabled a culture that undermines Army tradition.