For veterans readjusting to civilian life after 9/11, 44% said they had difficulty doing so compared with 25% of pre-9/11 veterans, according to a study by Pew Research. One explanation for the increased difficulty is that post-9/11 veterans were much more likely to serve in combat than those who served before them. Half of post-9/11 veterans who served in combat said they had trouble readjusting compared to 34% of post-9/11 veterans who did not see combat. Since being discharged from the military, 57% of post-9/11 combat veterans have experienced incidents of irritability or outbursts of anger. Family relations have been strained for 55% of combat veterans compared with 38% of veterans who did not serve in combat.