Multiple top aides to the defense secretary have been suspended over the last 24 hours.

A third top official at the Pentagon has been placed on administrative leave, two U.S. officials told ABC News on Wednesday.

Books on race, gender and national identity were taken out at the United States Naval Academy.

The Defense Department reinstated a story on its website about Jackie Robinson's military service after it was removed as part of the Pentagon’s crackdown on Diversity, Equity and Inclusion.

The Pentagon aims to cut 50,000 to 60,000 civilians -- and 21,000 voluntary resignations have been accepted so far.

ABC News’ Martha Raddatz interviews former Army Chief of Staff Gen. George Casey Jr. on “This Week.”

ABC News’ Martha Raddatz interviews Sen. Jack Reed, D-R.I., on “This Week.”

On “This Week,” ABC News’ Chief Global Correspondent and co-anchor Martha Raddatz reports on Trump’s firing of senior Pentagon officials.

At the Conservative Political Action Conference, President Donald Trump touted his efforts to cut waste from the federal government.

Plus, Israeli Prime Minister Benjamin Netanyahu vowed "revenge" after the Israeli military said one of the four bodies recently released by Hamas did not include hostage Shiri Bibas.

In response to Donald Trump's order banning DEI initiatives, the DIA has paused special event programs and related events, including for Martin Luther King Jr. Day.

The order would close the path for transgender troops to serve openly

Mark Milley's portrait as chairman of the Joint Chiefs of Staff was taken down from the Pentagon hallway where all of the paintings of the previous chairmen are located.

Gen. Mark Milley’s official portrait as chairman of the Joint Chiefs of Staff was taken down this afternoon from the hallway where it hung along with those of previous chairmen.

Pete Hegseth said he now supports women serving in combat roles so long as they meet the same standards as men -- a policy the military has had for nearly a decade.

Defense Secretary Lloyd Austin sent a weekend letter to Congressional appropriators urging them to pass government funding bills.

Both Hamas and Iran blame Israel for the attack that killed a Hamas leader in Tehran.

Defense Secretary Lloyd Austin revoked the plea deal bringing the death penalty back on the table for the alleged mastermind of the 9/11 terror attacks.

The Pentagon is downplaying the arrival of four Russian Navy ships in Cuba although U.S. Navy ships shadowed them as they made their way to Havana.

Defense Secretary Lloyd Austin confirmed the decision to pause munitions shipments to Israel on Wednesday. Plus, Jay O'Brien has report on attempt to oust House Speaker Mike Johnson.

ABC News' Devin Dwyer has an exclusive look at what the Pentagon is doing to combat PFAS and what's at stake in the Michigan community considered ground zero for the potentially toxic problem.

The Pentagon has announced new $6 billion military aid package for Ukraine

An exhaustive Pentagon review of decades of classified records of UFO sightings has found no links to extraterrestrials.

A U.S. official says things are still tense at the White House, citing security concerns.

A U.S. military response to the fatal drone attack in Jordan appears to be imminent. However, the Biden administration is taking steps to avoid an escalation to war.

The Pentagon announced the identities of three Army Reservists killed in a Sunday drone attack on Tower 22 in Jordan.

The Pentagon says the militants were about to target American forces with a drone attack.

Ballistic missiles were later fired from Houthi areas in Yemen, officials said.

ABC news contributor and former senior CIA field operative, Darrell Blocker joins ABC News Live anchor Diane Macedo to break down what role the U.S. could play in the next stages of the war.

The U.S. had warned Turkey the drone was flying above American forces.

A previously approved drag show to be held at Nellis AFB has been canceled by the Pentagon

Gen. Richard Edward Cavazos was the first Hispanic four-star general in the Army.

Reports have indicated suspect Jack Teixeira was driven to share classified documents to impress friends he made on the messenger platform Discord.

Two new videos were released at the rare open congressional hearing on unexplained aerial phenomena, or UAPs as the Pentagon calls them.

The Pentagon said it's working around the clock to understand the scope and scale of the leak of classified documents.

More than 30 pages of the classified material apparently containing intelligence on American adversaries and allies have been posted online.

An investigation has been launched by the Pentagon after apparently classified documents related to the war in Ukraine, Iran, North Korea and other regions were posted online.

Two separate attacks on U.S. bases are believed to have come from drones of Iranian origin.

A top official said there would be no advantage to training Ukrainians now.

As investigators uncover a significant portion of the alleged Chinese spy balloon, they said they are still looking for clues in the other flying objects that have appeared recently.

Gen. Patrick S. Ryder held a briefing after the White House announced a "high-altitude object" was shot down over Alaska on Friday.

As Chinese officials claim the airborne object is a weather balloon, U.S. officials are considering shooting it down.

In its review of hundreds of UFO incidents, Pentagon officials say they have not seen evidence so far that any are from extraterrestrials.

The entire fleet of H-47 Chinook helicopters have been grounded by the Army in order to fix a part problem in about 70 helicopters.

The U.S. Army has about 400 Chinooks in its fleet around the world, using them to transport troops and equipment as seen in the wars in Afghanistan and Iraq.

Lieutenant General Michael E. Langley was confirmed as the first Black Marine Corps four-star general.

Top Pentagon officials told a House panel that there are now close to 400 reports from military personnel of possible encounters with UFOs.

Officials said in congressional testimony they are "reasonably" sure pyramid-shaped objects in one video were drones.

U.S. Defense Secretary Lloyd Austin said Tuesday that any public statements by world leaders that the conflict in Ukraine could lead to a nuclear confrontation are "unhelpful and dangerous."

Commenting on Pentagon press secretary John Kirby's latest briefing, former U.S. defense official Mick Mulroy says it is unlikely that U.S. troops will be deployed in Ukraine.