Adm Philip S Davidson, left to right, US Secretary of Defence Lloyd Austin, Chairman of the Joint Chiefs of Staff Gen Mark A Milley and Adm John C Aquilino attend a Change of Command ceremony at Pearl Harbour. Cindy Ellen Russell/Honolulu Star-Advertiser via AP
Adm Philip S Davidson, left to right, US Secretary of Defence Lloyd Austin, Chairman of the Joint Chiefs of Staff Gen Mark A Milley and Adm John C Aquilino attend a Change of Command ceremony at PearlShow more

US Secretary of Defence outlines vision for how America fights 'the next war'