Red smoke is released to simulate a chemical attack blows in wind during exercise Scorpion Lens 15 on North Auxiliary Airfield in the city of North, S.C., Feb., 12, 2015. Red smoke is released to simulate a chemical attack blows in wind during exercise Scorpion Lens 15 on North Auxiliary Airfield in the city of North, S.C., Feb., 12, 2015. SHARE: Download: Full Size (2.69 MB) Tags: Photo Essays Credit: VIRIN: 267704-E-RAA23-203.jpg Photo Gallery