FILE - In this Monday, Feb. 15, 2010 file photo, a British soldier walks with his machine gun on the roof of a residential house in the village Qari Sahib, Nad Ali district, Helmend province, southern Afghanistan. Young men who have served in the British military are about three times more likely than civilians to have committed a violent offense, researchers reported Friday, March 15, 2013 in a study that explores the roots of such behavior. The research found that merely being sent to Iraq or Afghanistan made no difference in rates of violent crime later on. Instead, a key predictor was violent behavior before enlisting. (AP Photo/Altaf Qadri, File)LONDON (AP) — Younger males who have served within the British militia are about 3 times more likely than civilians to have committed a violent offense, researchers suggested Friday in a learn about that explores the roots of such conduct.