“We’re moving away from counterterrorism and counterinsurgency. We want to be postured for large-scale combat operations,” Wormuth told reporters on Tuesday. “So we looked at where were there pieces of force structure that were probably more associated with counterinsurgency, for example, that we don’t need anymore.”

According to an Army document, the service is “significantly overstructured” and there aren’t enough soldiers to fill existing units. The cuts, it said, are “spaces” not “faces” and the Army will not be asking soldiers to leave the force.

Instead, the decision reflects the reality that for years the Army hasn’t been able to fill thousands of empty posts. While the Army as it’s currently structured can have up to 494,000 soldiers, the total number of active-duty soldiers right now is about 445,000. Under the new plan, the goal is to bring in enough troops over the next five years to reach a level of 470,000.

The planned overhaul comes after two decades of war in Iraq and Afghanistan that forced the Army to quickly and dramatically expand in order to fill the brigades sent to the battlefront. That included a massive counterinsurgency mission to battle al-Qaida, the Taliban and the Islamic State group.

Over time the military’s focus has shifted to great power competition from adversaries such as China and Russia, and threats from Iran and North Korea. And the war in Ukraine has shown the need for greater emphasis on air-defense systems and high-tech abilities both to use and counter airborne and sea-based drones.

Army leaders said they looked carefully across the board at all the service’s job specialties in search of places to trim. And they examined the ongoing effort to modernize the Army, with new high-tech weapons, to determine where additional forces should be focused.