Spalding has written extensively on national security matters. He is currently working on a book concerning national competition in the 21st Century. His work has been published in The Washington Post, The Washington Times, Foreign Affairs, The American Interest, War on the Rocks, FedTech Magazine, Defense One, The Diplomat, and other edited volumes. His Air Power Journal article on "America’s Two Air Forces" is frequently used in the West Point curriculum.
Spalding is a Life Member of the Council on Foreign Relations. He has lectured globally, including engagements at the Naval War College, National Defense University, Air War College, Columbia University, S. Rajaratnam School of International Studies in Singapore, Johns Hopkins Applied Physics Laboratory, and other Professional Military Educational institutions.