Weather satellite of rotation and its elliptical orbit kept it from collecting a notable amount of useful data. The Explorer VI and VII satellites also contained weather-related experiments. The first weather satellite to be considered a success was TIROS-1, launched by NASA on April 1, 1960. TIROS operated for 78 days and proved to be much more successful than Vanguard 2. TIROS paved the way for the Nimbus program, whose technology and findings are the heritage of most of the Earth-observing satellites NASA and NOAA have launched since then. Beginning with the Nimbus 3 satellite in 1969, temperature information through the tropospheric
Weather Underground the first time its new name, the "Weather Underground Organization" (WUO), adopting fake identities, and pursuing covert activities only. These initially included preparations for a bombing of a U.S. military non-commissioned officers' dance at Fort Dix, New Jersey, in what Brian Flanagan said had been intended to be "the most horrific hit the United States government had ever suffered on its territory". Bernardine Dohrn subsequently stated that it was Fred Hampton's death that prompted the Weather Underground to declare war on the US government. In December 1969, the Chicago Police Department, in conjunction with the FBI, conducted a raid on