A former Army Green Beret who admitted divulging military secrets to Russia over a 15-year period has been sentenced to more than 15 years in prison.

CNN image(CNN) - A Green Beret who served multiple tours in Iraq and Afghanistan died Saturday during combat operations in Afghanistan, according to US Army special operations spokesman Lt. Col. Loren Bymer. Maj. James G. "Ryan" Sartor, 40, was from Teague, Texas, and was assigned to the 10th Special Forces Group. Ryan was a beloved warrior who epitomized the quiet professional," said Col. Brian R. Rauen, the commander of 10th Special Forces Group (Airborne). He completed the Special Forces Qualification Course to become a Green Beret in 2005 and deployed to Iraq with the 10th Special Forces Group (Airborne) in 2006, 2007, 2009, and 2010, the US Army said. Sartor's awards and decorations include the Bronze Star Medal with three oak leaf clusters, Defense Meritorious Service Medal, Joint Service Commendation Medal and more.