Some have challenged having to pay the money back, an inspector general said.

A U.S. intelligence community report concluded it was 'very unlikely' a foreign adversary was the cause.

The U.S. Air Force says a 23-year-old airman supporting its Special Operations Wing at Hurlburt Field, Florida, was shot and killed during an incident involving the Okaloosa County Sheriff’s Office

U.S. Marines and their Filipino counterparts have staged joint combat drills on the Philippines’ northernmost island along the strategic Bashi Channel off southern Taiwan, a flashpoint in the Washington-Beijing military rivalry

U.S. Central Command acknowledged that one year ago Friday, it mistakenly struck a civilian in a strike in Syria, not the al-Qaeda leader it was looking for.

Col. Ralph Puckett Jr.'s cremated remains lay in honor at the U.S. Capitol on Monday -- joining the rare company of the country's most distinguished citizens.

The Starr County Sheriff declined to release records from the March National Guard chopper crash, citing an ongoing investigation into whether criminality was involved.

The United States and Niger are discussing plans to withdraw American troops from the West African nation, ending more than a decade of military presence there.

There are more than 1,000 military personnel stationed at an American drone base near the Nigerien city of Agadez.

Military officials said 23-year-old Sgt. Colin Arslanbas died in an accident last week during a training exercise near Camp Lejeune, North Carolina.

A Marine died following an incident that occurred during a training exercise in North Carolina, U.S. Marine Corps officials said.

As Israel weighs its response to Iran’s attacks this weekend, U.S. officials are privately telling Israel that if it strikes back militarily, it will do so alone.

The U.S. military named the suicide bomber behind the attack at Abbey Gate during the American withdrawal from Afghanistan. Review finds troops didn't spot ISIS-K bomber.

The U.S. government says a foreign adversary is unlikely behind "Havana syndrome," even as the Pentagon Monday confirmed a new case involving a senior defense official.

ABC News’ Martha Raddatz interviews former CENTCOM Commander Gen. Frank McKenzie on “This Week.”

ISIS has a "strong desire" to attack the U.S. and other foreign powers -- a threat that is only growing -- retired Gen. Frank McKenzie warned on Sunday

Former Air Force members known as missileers, who worked at nuclear missile sites, are concerned about a rise in cancer cases among their group.

Gens. Mark Milley and Kenneth "Frank" McKenzie are testifying before a House committee about the U.S. withdrawal from Afghanistan in 2021

ABC News spoke with troops and their families in Newport News, Virginia.

The United States has conducted six defense strikes and fired 18 anti-ship missiles in Yemen after the Houthis fired two anti-ship ballistic missiles into the Red Sea.

The US military has lifted its flight ban on V-22 Osprey aircraft three months after a deadly crash in Japan killed eight service members.

The review looked at UFO sightings and reports dating back decades.

It will receive “large ships carrying food, water, medicine," an official said.

Mike Johnson said he will bring Gold Star parents who lost their children during the 2021 U.S. withdrawal from Afghanistan as guests at the State of the Union.

The Pentagon is expected to lift its ban on V-22 Osprey aircraft as early as next week, three months after deadly crash.

ABC News’ Britt Clennett got an inside look at the operations aboard the USS Eisenhower positioned in the Red Sea.

The Pentagon says Austin can still do his job from the hospital with classified communications systems, but the deputy secretary is prepared to take over duties if needed.

An investigation is ongoing with the Marines calling the crash a "tragic mishap."

Five Marines who died when their helicopter crashed in California during a routine training flight have been identified.

Five missing Marines have been confirmed dead more than 24 hours after their helicopter crashed in California, the U.S. Marine Corps said Thursday.

ABC News’ Matt Gutman is on the scene near the crash site of a U.S Marine helicopter.

The U.S. Marine Corps said the five missing Marines have been confirmed dead more than 24 hours after the crash of a CH-53E Super Stallion helicopter in Southern California.

The U.S. carried out an airstrike in Baghdad on Wednesday targeting a leader of an Iran-backed militia in Iraq that was blamed for attacks on U.S. forces

The Marines had been reported missing when their CH-53E Super Stallion helicopter was "reported overdue" Tuesday night.

Search crews were able to find the wreckage of the missing CH-53E Super Stallion helicopter hours after it was "reported overdue" to Marine Corps Air Station Miramar Tuesday night.

The chopper was found crashed in a California forest in East San Diego County.

The U.S. military is searching for a "super stallion" helicopter it said was "reported overdue" to a Marine Corps air station near San Diego overnight while it was en route from Nevada to California.

The CH-53E Super Stallion helicopter was en route from Nevada to California when it was "reported overdue" to Marine Corps Air Station Miramar late Tuesday night.

A White House advisor says "this was the beginning of our response." ABC News' James Longman reports.

George Stephanopoulos interviews White House National Security Adviser Jake Sullivan on “This Week.”

ABC News’ Marcus Moore reports on the latest in the U.S. airstrikes on “This Week.”

At least 36 strikes in 13 locations were launched in response to Iranian-backed Houthi drones and missiles threatening international ships in the region.

Iran-backed militias and Iranian military units in Iraq and Syria were targeted.

The death of 3 U.S. service members is forcing President Joe Biden to weigh military action that could carry risks of escalation and heavy political consequences.

Officials said they would play out "over the course of several days."

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

President Joe Biden said he holds Iran responsible for supplying the weapons to the people who carried out the attack.

American personnel possibly mistook the enemy drone for one of their own returning from a surveillance mission, two U.S. officials confirmed.

The attack marked the first deaths of U.S. troops since the start of the Israel-Hamas war. Deputy Pentagon press secretary Sabrina Singh has details.

Secretary of State Antony Blinken spoke after three U.S. service members were killed in Jordan by an Iranian-backed militia drone attack.