DOD 5402.01 Sec 3.3 part C

© Assistance in responding with assets with potential for lethality, or any situation in which it is reasonably foreseeable that providing the requested assistance may involve the use of force that is likely to result in lethal force, including death or serious bodily injury. It also includes all support to civilian law enforcement officials in situations where a confrontation between civilian law enforcement and civilian individuals or groups is reasonably anticipated. Such use of force must be in accordance with DoDD 5210.56, potentially as further restricted based on the specifics of the requested support.

Thats not a memo