NASA kicks off air quality study at Osan
Marc Knapper, U.S. Embassy Seoul deputy chief of mission, and Col. Andrew Hansen, 51st Fighter Wing commander, pose for a group photo with the Korea United States-Air Quality (KORUS-AQ) Experiment team and distinguished visitors at the media day on Osan Air Base, Republic of Korea, April 29, 2016. KORUS-AQ will collect air quality data over the Republic of Korea using aircraft, ground sites and ships from May 2 until June 12. The U.S. and South Korean aircraft will conduct coordinated flights from Osan Air Base. (U.S. Air Force photo by Staff Sgt. Jonathan Steffen/Released)