UFO News Article:

“UFO Over Arizona Makes ‘Swishing’ Sound”,

20 October 1973 
(The Arizona Republic, Phoenix, Arizona)

Sergeant Thomas Spilde, a U.S. Army policeman, and another guard sighted an oval shaped UFO with bright, blue lights over Yuma Proving Ground in Arizona on the night of 18 October 1973, The Arizona Republic reports.

The article is presented in the December 1973 issue (page 10) of Skylook, the official publication of the Mutual UFO Network:

http://www.theblackvault.com/encyclopedia/documents/MUFON/Journals/1973/December_1973.pdf (The Black Vault)

Quote from the article:

“Spilde told Yuma County sheriff’s deputies the object was surrounded by bright blue, strobe-type lights. It was much larger than a fighter plane, he said. It moved toward a chemical testing area, hovered a couple of seconds, then headed north and upward at a high rate of speed.”

Website: “U.S. Army Yuma Proving Ground”:

http://www.yuma.army.mil/

Wikipedia article: “Yuma Proving Ground”:

http://en.wikipedia.org/wiki/Yuma_Proving_Ground

Aerial view of Laguna Army Air Field 
(Yuma Proving Ground, Arizona) 
(panoramio.com/google.com photo)