`` Grable '' was a 280mm AFAP shell fired Use_firearm from the `` Atomic Cannon '' and was viewed Perception_active by a number of high-ranking military officials .

The test Testing series was notable as containing the first time an Artillery Fired Atomic Projectile AFAP artillery shell was fired Use_firearm ( `` GRABLE '' Shot ) , the first two shots ( both fizzles ) by University of California Radiation Laboratory—Livermore ( now Lawrence Livermore National Laboratory ) , and for testing out Testing some of the thermonuclear components that would be used Using for the massive thermonuclear series of Operation Castle .