1.5.7. Escape. Deadly force is authorized when it appears necessary to prevent the escape of a prisoner, provided there is probable cause to believe such person(s) committed or attempted to commit a serious offense, that is, one that involves immediate threat of death or serious bodily harm, and would pose an immediate threat of death or serious bodily harm to DoD forces or others in the vicinity. Source: AFI 31-117

Here’s the DoE’s version:

(5) Apprehension. When deadly force reasonably appears to be necessary to apprehend or prevent the escape of a person reasonably believed to: (i) have committed an offense of the nature specified in paragraphs (a)(1) through (a)(4) 1 of this section; or (ii) be escaping by use of a weapon or explosive or who otherwise indicates that he or she poses a significant threat of death or serious bodily harm to the protective force officer or others unless apprehended without delay.