Lt Gen John N.T. “Jack” Shanahan is the Director for Defense Intelligence (Warfighter Support) (DDI (WS)), Office of the Under Secretary of Defense for Intelligence, Pentagon, Washington, D.C. The DDI (WS) ensures combatant commands (CCMD) have the intelligence policy, processes, and resources they need to plan and conduct successful operations and campaigns. 

General Shanahan previously served as the Commander, 25th Air Force, Joint Base San Antonio-Lackland, Texas. In his position as 25th Air Force Commander, General Shanahan also served as the Commander of the Service Cryptologic Component. In this capacity he was responsible to the Director, National Security Agency, and Chief, Central Security Service, as the Air Force's sole authority for matters involving the conduct of cryptologic activities, including the spectrum of missions directly related to both tactical warfighting and national-level operations.

General Shanahan received his commission in 1984 as a distinguished graduate of the ROTC program at the University of Michigan. He has served in a variety of flying, staff and command assignments. His staff assignments include Northeast Asia Regional Exercise Branch Chief in the Operations Directorate at Headquarters U.S. Pacific Command; senior military assistant to the Assistant Secretary of Defense for International Security Affairs in the Office of the Secretary of Defense; and Deputy Director for Global Operations, Operations Directorate, Joint Staff. He commanded the U.S. Air Force Weapons School Support Division, Nellis AFB, Nevada; 480th Intelligence Group, Langley AFB, Virginia; 505th Command and Control Wing, Hurlburt Field, Florida; the 55th Wing, Offutt AFB, Nebraska; and the Air Force ISR Agency, Joint Base San Antonio-Lackland, Texas.

General Shanahan is a master navigator with more than 2,800 flying hours in the F-4D/E/G, F-15E and RC-135.  He is authorized to wear the master intelligence occupational badge.