[['name', 'launched', 'vehicle', 'ceased operation', 'notes'], ['injun 1', 'june 29 , 1961', 'thor - able', 'march 6 , 1963', 'failed to separate from solrad 3 , still in orbit'], ['injun 2', 'january 24 , 1962', 'thor - able', 'failed at launch', 'upper stage produced insufficient thrust'], ['injun 3', 'december 12 , 1962', 'thor - agena', 'august 25 , 1968', 'orbit decay and re - entry on august 25 , 1968'], ['injun 4', 'november 21 , 1964', 'scout x - 4', 'december 1966', 'still in orbit'], ['injun 5', 'august 8 , 1968', 'scout x - 4', 'june 1971', 'still in orbit'], ['injun 6', 'june 3 , 1974', 'scout x - 4', 'april 28 , 1978', 'main article : explorer 52']]
the Injun 2 was the only satellite to fail At Launch
the [ENT] was the only satellite to fail [ENT]