Shasta, the 12th scheduled full-scale test in the summer 1957, series, will be ready for firing at 4:45 a.m. Tuesday, July 30. It will be detonated from a 500 foot tower in area 2a of Yucca Flat. The experimental device was designed by the University of California Radiation Laboratory at Livermore. Its designed yield is below nominal.

There will be 66 experiments on the sequence timer. Civil Effects test will include continuation of the manned shelter exercise, with 15 members of the Civil Effects Test Group and the Navel Radiological Defense Laboratory manning an underground shelter at a distance of two miles from ground zero.

There will be eight military effects projects, one of them a test of nuclear detonation effects upon an unmanned U.S. Navy airship (blimp). Nine hundred (900) military personnel wil observe the shot. Two hundred (200) will be stationed at the official observer area, and seven hundred (700) will be in trenches at a distance of 4,500 yards. The group, in trenches, will include members of the Canadian Army as well as troops of the pentomic battle group from Fort Lewis, Washington who are here to participate in the Army maneuver to be held in connection with the shot scheduled for August 19.

A total of 48 aircraft wil participate. The 39 Air Force, five Army and four Navy planes will fly training as well as vital effects and and support missions. The Navy aircraft will be from the Naval Air Special Weapons Facility, Albuquerque, N. Mex., and the Air Force planes from the Wright Air Development Center, Dayton, Ohio; Air Force Special Weapons Center, Albuquerque, N. Mex.; George AFB, Calif.; Indian Springs AFB; and Air Defense Command bases.

The detonation will occur about 13 miles from News Nob, at a compass bearing of 14 degrees. There will be a light on the tower until shortly before shot time.