Historic photo shows man tamping down inside of howitzer.

Even before the United States joined World War I, transformations to the American military had begun in earnest. The National Defense Act of 1916 authorized growth of the army to include 21 field artillery regiments.

Pope Francis will conduct at mass at Sicily-Rome American Cemetery on November 2, 2017 at 3:15 p.m. to coincide with All Soul’s Day, a holy day of obligation in the Catholic Church that includes praying for the dead. The Vatican is organizing this mass, which is open to the public.

Pope Francis will conduct at mass at Sicily-Rome American Cemetery on November 2, 2017 at 3:15 p.m. Cemetery operations will be impacted the entire week of October 30th in the lead up to this event.

Two of the pathways leading to the flagpoles will be under maintenance beginning on November 6, 2017. Access to the cemetery will not be affected in any way, however, these paths will be closed to foot traffic during this time.

Renovation work to the outside of the visitor center at Flanders Field American Cemetery will begin on October 16, 2017. While access to the visitor center and the restrooms will not be affected, the accessible entrance to the building will shift based on the location of the work.

Due to renovation work, the chapel at Flanders Field American Cemetery will be closed beginning on Monday, October 16, 2017. The chapel is expected to reopen in spring 2018. Access to the cemetery grounds will not be affected.

In the distance the visitor center at Meuse-Argonne American Cemetery is barely visible.

The visitor center at Meuse-Argonne American Cemetery is closed until Monday, October 16, 2017 in the afternoon due to unexpected maintenance work. Access to the cemetery is not affected.

Two of the marble walls of the memorial are seen at an angle. Water is visible in the distance.

Due to renovations, the Guadalcanal Memorial is currently closed. The site is expected to reopen to the public in early October 2017.

To ensure the safety of visitors, the memorial is closed during the renovation process. The memorial is expected to reopen in November 2017.