Many of the weapons tested in Nevada are tactical devices, designed for use by the armed services against comparatively small restricted targets. In facet, it would take 10,000 of the smallest of these Nevada devices to produce explosive energy equal to that of the Bikini H-bomb, the effects of which were described in the Commission's February 15th report, Since the first tests were conducted at the Nevada site in 1951 more than 40 of these smaller atomic devices have been exploded, So far as I am aware, no person off-site has ever been injured as a result of these tests, Tne Commission's staff has reported on the basis of its nationwide monitoring, that the radioactive fallout from the Nevada tests, even in communities nearby the site, has never in any instance approached a level which is hazardous to health. The fallout experienced by most American cities has barely added to the level of nature's normal background radiation which is always present in the soil, water and air,