The American Battle Monuments Commission is a small independent agency of the Executive Branch of the federal government. It is responsible for:

• commemorating the services of the American Armed Forces where they have served since April 6, 1917 (the date of U.S. entry into World War I)
• through the establishment of suitable memorial shrines; designing, constructing, operating and maintaining permanent American military burial grounds in foreign countries;
• for controlling the design and construction of U.S. military monuments and markers in foreign countries by other U.S. citizens and organizations, both public and private; and
• encouraging the maintenance of such monuments and markers by their sponsors.

Source: ABMC.gov