No noise and hovering Close to Air Base

Was working at Tacoma Power on graveyard at approx. 2am I witnessed the object hovering over 38 & South Tacoma Way. No noise was heard and it was very quiet. I could hear a single cars tires on the road somewhere you know the way they thump on pavement when there new? This was how quiet it was.I was on the 2nd floor balcony when I first saw the object. It then move slowly south I went inside the building to go up one more floor came out on the next balcony and it was gone.Still very quiet.This location is  very close to McCord Air Force Base which is located at 112th and so.Tac. way.There was no air traffic that I noticed this night, just seemed really quiet all night ,I worked until 6am . I don't tell many people of this,I did tell my wife and some close friends.I know wat I saw and would swear to it on a Bible.Thanks
Witness indicates that date of sighting is approximate.  PD