United States: Twining's executive officer tells Keyhoe no means to contact UFOs exist
On May 7, 1958, Col. James C. Sherrill, executive officer to Gen. Nathan Twining, answered Donald Keyhoe that no effective means had been developed to communicate by radio or otherwise with unknown aerial objects.
Background
Keyhoe's friend Lou Corbin had heard from a military friend of Gen. Nathan Twining that Twining was still concerned about UFOs. Keyhoe wrote to Twining and received a note from Twining's executive officer, Col. James C. Sherrill: "No effective means have been developed for the establishment of communication by radio or otherwise with unknown aerial objects. The technical obstacles involved in such an endeavor, I am sure, are quite obvious to you." NICAP's UFO Investigator reported the reply in June 1958 under the headline that the Joint Chiefs of Staff cited technical obstacles to communicating with unknown aerial objects. Eberhart also cites Keyhoe's Flying Saucers: Top Secret. The account follows the entry in George M. Eberhart's chronology UFOs and Intelligence (CUFOS) and the sources cited there; it is not an independent determination by From Beyond Space.