(NewsNation) — As the U.S. Army struggles with recruitment, the series is slashing its force by about 24,000, or almost 5%, and restructuring to be better able to fight in future wars.

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

The cuts will primarily be in already-empty posts — not actual soldiers — including in jobs related to counter-insurgency that swelled during the Iraq and Afghanistan wars but are not needed as much today. About 3,000 of the cuts would come from Army special operations forces.

At the same time, however, the plan will add about 7,500 troops in other critical missions, including air defense and counter-drone units and five new task forces globally with enhanced cyber, intelligence and long-range strike capabilities.

The decision highlights that for years the Army has been unable 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.

According to the plan, the Army will cut about 10,000 spaces for engineers and similar jobs that were tied to counter-insurgency missions. An additional 2,700 cuts will come from units that don’t deploy often and can be trimmed, and 6,500 will come from various training and other posts.

There also will be about 10,000 posts cut from cavalry squadrons, Stryker brigade combat teams, infantry brigade combat teams and security force assistance brigades, which are used to train foreign forces.

The changes represent a significant shift for the Army to prepare for large-scale combat operations against more sophisticated enemies. But they also underscore the steep recruiting challenges that all of the military services are facing.

In the last fiscal year, which ended Sept. 30, the Navy, Army and Air Force all failed to meet their recruitment goals, while the Marine Corps and the tiny Space Force met their targets. The Army brought in a bit more than 50,000 recruits, falling well short of the publicly stated “stretch goal” of 65,000.

The previous fiscal year, the Army also missed its enlistment goal by 15,000. That year the goal was 60,000.

The Associated Press contributed to this report.