B-57 Sampler, Operation HARDTACK, Note Wing-tip Filter System Aircraft Unit and Task Group 7.4, Provisional. Aircraft Unit was defined thusly: aircraft for the task group. augmented ( The mission of the Test to provide, maintain, and operate It consisted of the Cloud Sampling Element by six B-57D aircraft of the 080th Strategic Reconnaissance Wing (Light), the Indirect Bomb Damage Assessment Element, the Very High Altitude-Ultra High Altitude Aircraft Element, the Ionosphere Element, the Air Force Effects Element, and the Navy Effects Element provided by .Naval Air Special Weapons Facility, Kirtland Air Force Base, As of the 17th of October 1957, tentative plans called for having the Cloud Sampling Element in place at Eniwetok by 15 March 1958, The other elements of the Test Aircraft Unit also received readiness dates, 178 AFWL/HO SEH -2 -003) at