In Afghanistan, the work of USAF Special Operations Forces was not seen but most assuredly felt. Masters of Invisibility By Richard J. Newman, Air Force Magazine It wasn't standard procedure, but the circumstances called for urgent action. North of Kandahar in Afghanistan, several US soldiers had been gravely wounded. Enemy forces were reported to the south. It was broad daylight, and local Afghans--loyalties unknown--were watching from surrounding hillsides. Soon, two MH-53 Pave Low helicopters--Chalk 1 and Chalk 2--from USAF's 20th Special Operations Squadron were speeding toward the site. As they did so, a medic on Chalk 1 pointed out that...