This bill instructs the Department of Defense (DOD) to notify the congressional defense committees within 48 hours after any sensitive military cyber operation has been conducted. A sensitive military cyber operation is an offensive cyber operation or a defensive cyber operation outside DOD's information networks to defeat an ongoing or imminent threat that: (1) is carried out by the U.S. Armed Forces or by a foreign partner in coordination with them, and (2) is intended to cause effects outside of a geographic location where the Armed Forces are involved in hostilities. DOD must also notify such committees within 48 hours after: (1) the completion of any review of the legality under international law of a cyber capability that is intended for use as a weapon; and (2) the use as a weapon of any cyber capability that has been approved under international law. Such notification requirements shall not apply to: (1) a training exercise conducted with the consent of all of the nations where its intended effects will occur, or (2) a covert action.