The military said today that the soldier, whose name has not been released, "violated rules and regulations," which required him to be disciplined.
He was initially given an 11-day prison sentence. The punishment was later converted to being confined to base for the same duration after relatives talked to the media and a lawmaker wrote to the defense minister about the case.
Israel's army maintains kosher kitchens on its bases.
Israel Radio says the soldier, who moved to Israel from Boston recently, was unaware of the army's strict dietary restrictions and was merely snacking on a lunch his secular grandmother had made him.