AIR & SPACE MAGAZINE Dogged by Dust Helicopter operations in sandy terrain make for ruff going. Photo: US Army/Sgt Jason Brace August 19, 2011 A military working dog, assigned to 172nd Cavalry Regiment, wears his doggles, his assigned personal protective equipment to protect his eyes, as a Chinook helicopter takes off, kicking up dust and debris, during an air assault operation, in Parwan province, Afghanistan, May 11, 2010. U.S. Soldiers, of Alpha Troop, 1st Squadron, 172nd Cavalry Regiment, 86th Infantry Brigade Combat Team visited a remote village, in Parwan province to conduct a key leader engagement with village elders. (U.S. Army photo by Sgt. Jason Brace/Released) U.S. Army Sgt. Jason Brace Get the latest stories in your inbox every weekday.