One of six SNARK missile hangars at former Presque Isle (ME) AFB. SNARK's were the USA's earliest intercontinental ballistic missiles. Presque Isle AFB was the country's only SNARK base. The missile was deemed obsoliete in June 1961, only a little more than a year after the first SNARK missile officially went on alert.
More at wikipedia: http://en.wikipedia.org/wiki/SM-62_Snark