Army Sgt. 1st Class Joshua Gendron carries the remains of Army Sgt. Charles Schroeter, who was awarded the Medal of Honor for gallantry in an 1869 battle during the Indian Wars. Chris Carlson/AP hide caption

itoggle caption Chris Carlson/AP

A cypress tree swamp in Byrnes Lake, part of the more than 200,000-acre Mobile delta. It's the most biologically diverse river delta system in the country. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

Protesters close their eyes in silent prayer as they stand on the South Carolina Statehouse steps during a rally to take down the Confederate flag, Saturday, June 20, 2015, in Columbia, S.C. Rainier Ehrhardt/Associated Press hide caption

itoggle caption Rainier Ehrhardt/Associated Press

An African-American Army cook at work in City Point, Va., sometime between 1860 and 1865. Food played a critical role in determining the outcome of the Civil War. Library of Congress hide caption

itoggle caption Library of Congress

The ill-fated Sultana in Helena, Ark., just before it exploded on April 27, 1865, with about 2,500 people aboard. Most were Union soldiers, newly released from Confederate prison camps. Library of Congress hide caption

itoggle caption Library of Congress

Re-enactors re-create the Battle of Appomattox Court House as part of the 150th anniversary of the surrender of the Army of Northern Virginia at Appomattox Court House. Steve Helber/AP hide caption

itoggle caption Steve Helber/AP

Daniel Majook Gai from South Sudan goes in and out of his war-torn country to help children there go to school. Courtesy of Project Education South Sudan hide caption

itoggle caption Courtesy of Project Education South Sudan

1st Lt. Alonzo Cushing, shown in an undated photo provided by the Wisconsin Historical Society, is expected to get the nation's highest military decoration --€” the Medal of Honor --” this summer, nearly 150 years after he died at the Battle of Gettysburg. Wisconsin Historical Society/AP hide caption

itoggle caption Wisconsin Historical Society/AP

Waverly Adcock, a sergeant and founder of the West Augusta Guard, prepares his company for inspection and battle at a Civil War re-enactment in Virginia. Sara Smith, whose great-great-grandfather was wounded at the Battle of Gettysburg, holds the Confederate battle flag. Courtesy of Jesse Dukes hide caption

itoggle caption Courtesy of Jesse Dukes

A small group of 8- to 12-year-olds learn about how soldiers trained for the Civil War. Michael Tomsic/WFAE hide caption

itoggle caption Michael Tomsic/WFAE

How did the food taste? These faces say it all. Photograph from the main eastern theater of war, Meade in Virginia, August-November 1863. Timothy H. O'Sullivan/Library of Congress hide caption

itoggle caption Timothy H. O'Sullivan/Library of Congress