FORT BELVOIR, Va. (AP) — The planned National Museum of the United States Army is reaching a construction milestone.

The Army Historical Foundation says a “topping out” ceremony is scheduled for Friday morning when workers will place the museum building’s final steel beam into place.

Groundbreaking on the long-planned museum began last year. It is expected to open in late 2019 on the grounds at Fort Belvoir in northern Virginia.

The 185,000-square-foot (17,000-square-meter) facility is being built on 84 acres (34 hectares) on the base, south of the nation’s capital.