Joint Base Lewis - McChord soldiers have been involved in several violent incidents . Four soldiers from the base are accused of killing Afghan civilians in 2010 . The soldier accused in Sunday 's deaths remained in U.S. custody on Monday as investigators try to determine his motive , including examining his mental stability and medical history . One veterans ' group called it ` ` a rogue base with a severe leadership problem ''
Joint Base Lewis - McChord soldiers have been involved in several violent incidents . Four soldiers from the base are accused of killing Afghan civilians in 2010 . One veterans ' group called it ` ` a rogue base with a severe leadership problem ''