I was a soldier, stationed at Ft. Monmouth, NJ at the time of the sighting.
As I walked West towards my barracks on a cold clear night in December, I first noticed the object at about 30° elevation.
It moved steadily on the same course for about 20 seconds.
Then, it abruptly stopped without decelerating for what seemed to be a minute or so.
It abruptly restarted, at the same speed as before and remained on the same course.
This behavior repeated 2 more times.
Then the object zipped up at about a 70° angle towards the northeast, getting smaller as it disappeared in about 2 seconds.
During the observation period there was no sound, and no change in brightness or color.