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A calibration gas is a reference gas or gas mixture used as comparative standard in the calibration of analytical instruments, like gas analysers or gas detectors.Therefore, a calibration gas has to be of a precisely defined nature or composition, like zero gas or span gas, for example 500 ppm carbon monoxide in nitrogen.
In November 1962, the 455th Strategic Missile Wing was the fourth United States Air Force LGM-30 Minuteman ICBM wing, the third with the LGM-30B Minuteman I.In 1962 and 1963 150 missiles were deployed to silos controlled by three squadrons of 455th in North Dakota.