Mesmerizing daylight, close encounter at Oakdale,PA Army base in summer of 1966, witnessed by at least 100 guys.

I was stationed at Oakdale Army base from 9/65 to 2/67 and worked the the MPs. Oakdale has a radar facility.  I'm unsure of the exact month and year of this event, guessing summer 66. This happened on a late Friday afternoon as we were off duty and preparing for the weekend. Guys were packing, showering, rushing around, when all of a sudden some guy says "good Lord look out your windows".  So everyone pushed their way to windows and to see a huge gunmetal grey craft just hanging low in the sky near the radar. I'm not good at measurements and distance but it was no more than a football field away. There was no sound coming from the craft and around the edge were colored rotating windows/lights. Everyone who was outside the barracks were just standing transfixed with their mouths hanging open as were those inside looking from the windows. I have no idea how many guys were there I'm guessing at least 100. This event lasted 10 minutes at the most and the craft shot away in a flash. What a buzz of chatter afterwards. Someone who worked at the radar station phoned to see what was going on and to explain what we had just seen. They answered that nothing showed up on the radar and to forget what we just saw and not talk about it. I don't remember much talk about it after the weekend. I never did forget. It was a spectacular sight to see a craft so close in bright daylight and not so easily dismissed by me. The odd thing is that every guy there probably had a camera but they were so transfixed and no one got a photo. You can't tell me they don't exist.