After the terrorist attacks on the World Trade Centers Twin Towers in New York and at the Pentagon, when hijackers deliberately flew civilian airliners into the buildings, on the morning of 11 September 2001, Ramstein Air Base, Germany moved into Threatcon Delta. Photographic SPECIALIST, SENIOR AIRMAN Kristin Conway, USAF, (right), and Graphics Technician, STAFF Sergeant Vicki Aiken, USAF, both with the 786th Communications Squadron go over procedures for clearing their Colt 5.56 mm M16A2 rifles during their initial Security Forces Augmentee Training