Americorps volunteer James McCall uses a weed trimmer to help clean up a historic African-American cemetery Saturday morning as part of National Public Lands Day in the Vicksburg National Military Park. The holiday is the nation’s largest single-day volunteer effort for public lands. (Justin Sellers/The Vicksburg Post)

Ibrahim Blake, 12, helps clean up a historic African-American cemetery Saturday morning as part of National Public Lands Day in the Vicksburg National Military Park. The holiday is the nation’s largest single-day volunteer effort for public lands. (Justin Sellers/The Vicksburg Post)

Landon Nichols, 6, right, and Nathan Austin, 8, carry pieces of a log Saturday morning while cleaning up a historic African-American cemetery as part of National Public Lands Day in the Vicksburg National Military Park. The holiday is the nation’s largest single-day volunteer effort for public lands. (Justin Sellers/The Vicksburg Post)