I've seen that plane on a few occasions, it's based nearby at McGuire AFB. It's operated by the NJ
-ANG 108th Air Refueling Wing. It was even listed in a magazine I read at Barnes And Noble which had a list of Air Force Units and types of aircraft operated, I had a post asking about it when I first saw it a year or two ago.
I've seen it on the NJ
-ANG ramp, amongst the other KC
-135s. All white 757 Sticks out like a sore thumb among all those grey KC
-135s on the NJ
-ANG ramp, they also have an all white KC
-135 which I think they use for training. Im not sure if it has a boom or not, it's flying touch and goes for what seems like hours some days.