I can personally attest that Americans were very well served by those they elected to fill critical national security positions. There is one important exception to that statement — our curre…

The American weapons are part of a $350 million package that President Biden authorized on Saturday.

The recovery of large amounts of American cash at a Taliban outpost in Afghanistan helped tip off U.S. officials. It is believed that at least one U.S. troop death was the result of the bounties.

The plans call for up to 120,000 American troops but not a land invasion of Iran. They were updated at the request of John R. Bolton, the national security adviser.

After a lull of several weeks, American troops and Syrian Kurdish fighters are once again conducting large-scale counterterrorism missions.

The military never conducted an independent investigation into a 2019 bombing on the last bastion of the Islamic State, despite concerns about a secretive commando force.

The operation would sweep away American-backed Kurdish forces near the border in Syria. The White House said U.S. forces “will no longer be in the immediate area.”

The officer’s combat death came as President Trump considers pulling back on American operations in the region.

Ukrainian troops have mounted a stiffer-than-expected opposition to a superior force in the early days of the war. But U.S. officials say it may not last.

The saga might never have come to light had the Navy not posted a photograph of the Carl Vinson sailing through the Sunda Strait, which separates two Indonesian islands.

The arrest of Jack Teixeira, a junior Massachusetts airman, in the leaking of classified documents opens a debate about security clearances.

The president said that he would end support for Saudi Arabia in its intervention in Yemen and that the U.S. would no longer be “rolling over in the face of Russia’s aggressive actions.”

Attempts at diplomacy have hit a stone wall as President Vladimir V. Putin of Russia refuses to engage in any serious negotiation, but his endgame is unclear.

The gunman who killed three in Florida was not directed by Al Qaeda, nor inspired solely by online ideology. He was a new kind of terrorist, harder to spot: an extremely enterprising freelancer.

The Biden administration and its allies are developing new possible sanctions ahead of a series of meetings to defuse the crisis with Moscow.

President Trump’s new acting secretary of defense began a since-aborted diplomatic gambit last month to negotiate with a Somali terrorist group — drawing the ire of the secretary of state.

The troops will be the National Guard and not active-duty. But officials know such events are fraught with risk and cite Kent State in 1970, Tiananmen Square in 1989 and Tehran in 2009.

Videos and photos show the bodies of soldiers left behind on the battlefield, officials say, and the charred remains of tanks and armored vehicles.

An American strike cell alarmed its partners as it raced to defeat the enemy.

Errant Saudi-led airstrikes have killed more than 4,000 civilians, upending the U.S. policy of selling weapons with the expectation that they will rarely be used.

The suicide bomber who killed nearly 200 people, including 13 U.S. troops, had been freed from prison by the Taliban days before the attack.

Recently leaked intelligence documents called the incident, last year, a near shoot down. Officials said it was more serious than originally reported.

The high-profile episode, after days of protests in Washington, was a turning point in the military’s response to unrest in the city.

Latvia, Lithuania and Estonia are keen to accept help and are shoring up their own modest defense capabilities. But what happens when President-elect Donald J. Trump takes power is an open question.

Classified documents detailing secret American and NATO plans have appeared on Twitter and Telegram.

Requiring higher-level approval is a stopgap measure as officials review whether to tighten Trump-era targeting rules and civilian safeguards.

The Obama administration had handed off much of the C.I.A.’s deadly drone program to the military. President Trump has eased those limits on secret airstrikes by the agency.

The relocations are meant to place interpreters and others who worked with departing American forces somewhere safe until visas for them to enter the United States are processed.

The Pentagon’s latest admission illustrates the botched intelligence behind the strike that mistakenly killed 10 civilians in August.

Special Operations forces used a secret weapon designed to limit civilian casualties to strike the Qaeda veteran this month.

The deployment of armored vehicles, advance radar and more fighter jets comes in response to a Russian convoy ramming an U.S. ground patrol, injuring seven soldiers.

The military never conducted an independent investigation into a 2019 bombing on the last bastion of the Islamic State, despite concerns about a secretive commando force.

The Nigerien authorities believe they may have captured Doundoun Cheffou, a militant leader tied to the deaths of four American soldiers in October.

The White House had made clear to Pentagon officials that President Trump did not want to see Lt. Col. Alexander S. Vindman promoted.

The powerful and highly mobile weapons systems, which can fire guided rockets with a range of 40 miles, are desperately needed in the battle for eastern Ukraine.

Under President Trump, there are now more troops in the Middle East than when he took office, and he has continued the mission for tens of thousands of others far from the wars of 9/11.

The coronavirus crisis aboard the carrier Theodore Roosevelt spurred another chapter in the hollowing out of the Navy’s leadership, in particular under the Trump administration.

The mission in Germany would streamline a training and assistance system that the United States and its allies created on the fly after Russia’s invasion, officials said.

Photographs of Guard soldiers resting on the concrete floor of a parking garage prompted swift condemnation and apologies from members of Congress.

The coronavirus crisis aboard the carrier Theodore Roosevelt spurred another chapter in the hollowing out of the Navy’s leadership, in particular under the Trump administration.

The Ukrainian military has battled Russia with retrofitted equipment, including missiles and rocket systems mounted on trucks and speedboats, experts and officials say.

Russian troops are engaging in standoffs with U.S. troops guarding oil fields and fighting remnants of the Islamic State.

A little-known group at U.S. European Command in Germany fills Ukraine’s battlefield requests with donations from more than 40 countries.

President Volodymyr Zelensky wanted to make a dramatic move in the war against Russia. U.S. and Ukrainian officials came up with a plan.

The Pentagon’s latest admission illustrates the botched intelligence behind the strike that mistakenly killed 10 civilians in August.

A large number of people potentially had access to the Pentagon intelligence documents posted on social media.

At the end of a 10-week crash course at a U.S. Army base in Oklahoma, the Ukrainians are essentially running their own training in preparation for the front lines.

Israeli agents shot Abu Muhammad al-Masri on the streets of Tehran at the behest of the U.S., officials said, but no one — Iran, Al Qaeda, the U.S. or Israel — has publicly acknowledged the killing.

U.S. Special Operations forces conducted a predawn raid in neighboring Nigeria to free the American before he could be sold to terrorists.

The Defense Department said Christopher Maier resigned, but his supporters say he was forced out of a job leading military efforts to combat ISIS.

So far, there is no evidence the appointees harbor a secret agenda or arrived with an action plan. But their sudden appearance amounts to a purge of the Pentagon’s top civilian hierarchy without...

Mike Pompeo and other aides to President Trump are discussing ending a bipartisan review process because lawmakers have held up sales to Saudi Arabia over civilian casualties in Yemen.

The president appears to be trying to balance competing impulses: bringing troops home while ensuring that efforts to contain ISIS will continue — and answering withering criticism for his Syria...

At least 1,000 fighters from Russia’s Wagner Group are expected to focus on the Kremlin’s goal of seizing eastern Ukraine.

Thomas B. Modly’s departure is the latest in a string of events that engulfed the Navy in a public relations disaster.

The status of a $110 million air base in the desert remains unclear as the West African country deepens its ties with Russia.

Yevgeny Prigozhin, the head of Wagner, may have believed he had support in Russia’s military.

Poor logistics and flagging morale have plagued a disjointed military campaign in Ukraine, according to American officials and independent analysts.

The gunman who killed three in Florida was not directed by Al Qaeda, nor inspired solely by online ideology. He was a new kind of terrorist, harder to spot: an extremely enterprising freelancer.

The factors behind the failure to prevent a terrorist attack include a distrust of foreign intelligence, a focus on Ukraine and a distracting political crackdown at home.

Poland’s president said his country would send Soviet-designed MIGs to Ukraine, in what would be the first delivery of fighter jets from a NATO country.

Biden administration officials vowed to continue sending military, economic and humanitarian aid to help Ukraine defend itself against Russia.

Classified documents detailing secret American and NATO plans have appeared on Twitter and Telegram.

Some members of the D.C. Guard — comprising more than 60 percent people of color — have not told family they were part of the crackdown. Guard leadership, concerned about public opposition, even...

The cuts to the National Counterterrorism Center were smaller than some former officials feared. The changes will allow intelligence agencies to shift personnel to other threats.

The brazen Shabab assault at Manda Bay, Kenya, a sleepy seaside base near the Somali border, on Jan. 5 left three Americans dead, raising complex questions about the military’s mission in Africa.

“Could we have stopped Turkey from coming in?” William V. Roebuck asked in an internal memo.

The secretary of state’s acknowledgment came as a new detail surfaced about the intelligence that led to the C.I.A. assessment.

Two of them made threatening comments toward lawmakers, and one expressed support for President Trump. The others were removed for a wide variety of reasons.

The young Marines in Kabul were left to determine who was evacuated from Afghanistan and who was left behind. The cost was high.