Pentagon Meeting Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, participates in the fourth Ukraine Defense Contact Group hosted by Secretary of Defense Lloyd J. Austin III virtually from the Pentagon, July 20, 2022. Celeste Wallander, assistant secretary of defense for international security affairs, also participated. SHARE IMAGE: Download Image: Full Size (1.6 MB) Tags: Milley, Leaders, Chairman, Ukraine Response Photo By: Chad McNeeley, DOD VIRIN: 220720-D-TT977-0071.JPG Photo Gallery