An article on the Defense Department website devoted to Jackie Robinson’s military career disappeared and then reappeared, joining a series of government web pages on Black figures that have vanished under the Trump administration’s efforts to purge government websites of references to diversity and inclusion.
The brief biography describes Robinson’s childhood in California, his time in a segregated Army unit during World War II and his role in breaking baseball’s color barrier.
But for much of Wednesday, it displayed a “Page Not Found” message. When it reappeared Wednesday afternoon, there were no notable changes.
The discovery that the page had vanished generated significant backlash on Wednesday. “You can’t make this up!” Senator Tim Kaine, Democrat of Virginia, wrote on social media.
Representative Yvette Clark, a New York Democrat who represents the section of Brooklyn where Robinson once played, accused the Trump administration of erasing Black history.
“It doesn’t matter if his administration wants to walk back their attempt to censor” the page, Ms. Clark wrote on social media, “we know what they tried to do, and we’ll never forget it.”
Since President Trump swept into office, a number of pages, sites and resources focused on the achievements of African Americans disappeared from military sites. Some have returned. Others have not.
Pages of the website for Arlington National Cemetery highlighting the graves of Black and female service members vanished. The cemetery, which is run by the Army, has said that it is working to restore content in compliance with Mr. Trump’s executive orders, and that it aims to reintroduce content soon.
A Defense Department page featuring the biography of Maj. Gen. Charles Calvin Rogers, a Black Army general who received the Medal of Honor, also disappeared and then was restored.
And for nine days, the Air Force paused the use of an instructional video for trainees about the accomplishments of the first Black pilots in the military, according to the Air Education and Training Command.
John Ullyot, a Pentagon spokesman, said in a statement that “DEI is dead at the Defense Department,” adding that he was pleased with the department’s “rapid compliance” with a directive ordering diversity-related content removed from all platforms.
“In the rare cases that content is removed — either deliberately or by mistake — that is out of the clearly outlined scope of the directive, we instruct the components and they correct the content accordingly,” he added.
The Pentagon leadership under Mr. Trump has made clear its disdain for the military’s decadeslong efforts to diversify its ranks. Last month, the defense secretary, Pete Hegseth, said that the “single dumbest phrase in military history is ‘our diversity is our strength.’”
Robinson was drafted into the Army in 1942 and was stationed in Fort Hood, Texas, according to the Defense Department. At one point while serving in the military, he was taken into custody after refusing to sit in the back of an Army bus.
His journey into the majors also started in the segregated section of a bus. He was required to sit in the back on the way to spring training in Sanford, Fla., after signing a minor-league contract with the Brooklyn Dodgers.
Robinson endured intense verbal abuse when he integrated Major League Baseball during the 1947 season. A standout on the diamond, he played 10 seasons in the majors, all for the Dodgers, and won the National League’s Most Valuable Player Award in 1949.
He died in 1972. For his role in integrating baseball, his number, 42, was retired across M.L.B. in 1997. Every April 15, the anniversary of his debut, the league celebrates Jackie Robinson Day, and every player wears his number.
He is the only baseball player to receive such an honor.
David Robinson, a son of Jackie Robinson, said in a statement on Wednesday that he was surprised to learn of the page’s removal, and that he took “great pride” in his father’s military service.
“He worked tirelessly on behalf of equal opportunities, in education, business, civic engagement, and within the justice system,” the statement said, adding, “he of course is an American hero.”
Matthew Mpoke Bigg contributed reporting.