FLOSSING LESSON U.S. Army Spc. Kassandra Torres, right, shows Afghan commando medics the proper way to floss during a basic dental class on Forward Operating Base Thunder in Paktya province, Afghanistan, July 21, 2013. Torres, a dental assistant, is assigned to the 3rd Special Forces Group. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 613203-F-XTZ33-267.jpg Photo Gallery