For nearly 40 years, the U.S. military has separated the responsibility for force generation — the imperative to “man, train, and equip” personnel for their specific domains — from the responsibility of force employment — the use of troops in combat. The independent services — the Army, Navy, Air Force, Marine Corps, and Space Force — generate forces, while the unified combatant commands employ forces and can request manpower from each of the services. For every domain but cyberspace, the United...