JM 9-21.990
Once a witness has been accepted into the Witness Security Program, even if the witness is no longer in the Program, he or she will receive protection in the courtroom for testimony in the case or cases for which the witness entered the Program. If the witness is no longer in the Program, but not living in an area considered to be dangerous to them, the USMS may also produce them for the testimony. If there is clear evidence that a witness who has had their participation in the Program terminated is in immediate jeopardy arising out of the former cooperation, through no fault of the witness, the need for further protective services will be evaluated, and provided, if appropriate.