DENVER (AP) â Fort Carson soldiers returning from deployment in Iraq are suspects in at least five slayings, and officials want to know why. Commander Maj. Gen. Mark Graham announced Friday a task force will examine any commonalities in the five killings, all committed in Colorado, allegedly by soldiers from the post's 4th Brigade Combat Team in the past 14 months. A sixth BCT soldier faces an attempted murder charge. "We have many great young Americans in our Army who have volunteered to serve during a time of war, almost all of whom are great citizens," Graham said in a statement. "However, we too are very concerned about these horrible acts." Fort Carson also plans to re-screen about 1,200 soldiers from the brigade for potential physical or mental health problems. Maybe the vaunted US arrangements for screening and dealing with PTSD are not working as they should?