NEW ORLEANS (AP) — About to be overrun by Germans, a young black lieutenant called in an artillery barrage on his own position, knowing he'd be killed. It was the only way to hold off the enemy.

The sacrifice by 1st Lt. John Fox is one of many endured by the 100,000 African-American service members during World War II and is now the focus of an exhibit at the National World War II Museum in New Orleans.

Titled "Fighting for the Right to Fight: The African American Experience in WWII," the exhibit runs from July 4 through May 30, 2016. It describes discrimination before and after the war as well as in the military during World War II.

The exhibit also includes an original 8 1/2 -minute video about the famed Tuskegee Airmen — the first group of African-American pilots to serve in the U.S. military —and video interviews with 10 veterans, including Rothacker Smith of Huntsville, Alabama who served in the 366th Infantry Regiment.

A Seventh-Day Adventist and conscientious objector to combat, Smith — serving in the same segregated 92nd Infantry Division to which Fox also belonged — was drafted and became a medic. Often Smith was the only African-American on the bus back from town to Camp Stewart, Georgia, on Saturday nights. He remembers being made to sit in the baggage compartment behind the back seats.

Smith was stationed in southern Italy, where his unit guarded airfields, one of many noncombat jobs to which blacktroops were relegated. But the war's heavy death toll eventually sent more African-American troops into combat. Smith was assigned to a machine-gun nest in Sommocolonia, Italy, where Fox was a forward observer directing fire for one of the 366th's artillery units.

By that time, ammunition was running so short in Italy that it was rationed, said John H. Morrow, a University of Georgia history professor and co-chair of the national advisory committee that drew up plans for the exhibit. Smith said that when the sergeant in charge of the machine gun crew called on Christmas Day for a barrage on German artillery, he was told, "We can't fire until tomorrow morning because we used up our 16 rounds for today."

The morning of Dec. 26, 1944, a German mortar shell hit the window of the stone house where the machine-gunners and Smith were holed up. Smith was hit in several places, including his right hip, elbow, upper back and cheek. He used his teeth and left hand to bandage his sergeant, who was more severely injured.

Later in the day, as the Germans pressed their attack toward Fox, he made the ultimate sacrifice: he called in artillery fire right on his own position.

Smith knew, from their location, that the guns were American.

"But I didn't know the significance of it until 50 years later," he said.

Smith was captured and taken prisoner by the Germans until his release on April 29, 1945. Unlike many POWs, he said, he was able to keep all his clothes because they were bloodstained and full of holes. He has donated his long-sleeved, blood-soaked undershirt to the museum.

After helping to defeat the tyranny of Nazi Germany and its allies, black soldiers returned home, expecting a more tolerant nation. Most were deeply disappointed.

"Segregation was still the law of the land, and racism was alive and well," the museum's website says. "For many African American veterans, that disappointment became determination to create change. They fought against segregation and discrimination with the same sense of purpose that had defeated the Axis."

It is no coincidence, the exhibit points out, that many leading figures of the civil rights movements of the 1950s and 1960s were veterans, including Medgar Evers, who became one of Mississippi's most active civil rights leaders and was buried with full military honors at Arlington National Cemetary after he was assassinated by a white supremacist in 1963..

In 1995, Smith returned to Sommocolonia with his sons. They saw a memory garden listing the names of Italians killed on the day he was wounded and one American name: Lt. John Fox.

Fox was among seven African Americans awarded the Medal of Honor in 1997 for service during World War II, after President Bill Clinton ordered an investigation of why blacks had not been receiving the medal. Five of those medals were loaned to the exhibit, curator Eric Rivet said.

"It's the first time they've been together since they were awarded in 1997," Rivet said.

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(Photo: Jeff Johnston,The National WWII Museum via AP)