Case 835 -- July 12, Seattle, Washington: Seaman John C. Kennedy and Seaman Ben Bobberly were on duty at Sand Point Naval Air Station in northeast Seattle on Lake Washington when, at 6:35 p.m. PST, they saw what appeared to be a disc-like object flying overhead. "It was headed east, toward Kirkland, over Lake Washington," Kennedy later reported, "and at, I should say, a 12,000-foot altitude. It was silvery, perfectly round and made no noise that I could hear." He said they had reported the sighting to officers at the base.            

Note: NOT President John F. Kennedy who was also a seaman.          

Reference for the above text is: Website: NICAP (National Investigations Committee on Aerial Phenomena): The 1947 UFO Chronology:

UFOCAT PRN 66605           
UFOCAT URN 066605 
Ted Bloecher investigation files, 07-13-1947  
UFOCAT URN 013016 Report on the UFO Wave of 1947 by Ted Bloecher, case #835, 1967         
UFOCAT URN 128568 A Geo-Bibliography of Anomalies by George Eberhart, #0053, 1980           
UFOCAT URN 162549 *U* UFO Computer Database by Larry Hatch, # 01156, 2002         

North America United States, Washington, King       
Kirkland                 Latitude 47-40-53 N, Longitude 122-12-31 W (D-M-S) [populated place]  
Lake Washington   Latitude 47-37-10 N, Longitude 122-14-44 W [lake]         
Sand Point             Latitude 47-40-55 N, Longitude 122-15-11 W [populated place]  
Sand Point Naval Air Station   Latitude 47-40-52 N, Longitude 122-15-05 W [Naval Air Station Seattle (historical)  military]           
Seattle                   Latitude 47-36-22 N, Longitude 122-19-55 W [populated place]      
Reference: http://geonames.usgs.gov/pls/gnispublic/f?p=154:1:1765846258792399