compares

The nearly nine-month extended deployment of the USS Abraham Lincoln in the Middle East has triggered a mental health crisis among the crew so intense that some sailors have tried to jump overboard, according to some US media reports.

Family members of the exhausted military crew on board the flagship aircraft carrier, reportedly located in the Gulf region, say there are food shortages, while broken toilets and showers have contributed to unsanitary conditions and poor health.

More than 5,000 staff members have been on board the vessel, which has been conducting maritime security and blockade operations at present around the Strait of Hormuz, for that time. It set sail on November 21, 2025 from its homeport of San Diego for an extended deployment to the Asia Pacific and the Middle East.

Since then, the ship has made just one single-day port stop at Naval Base Guam from December 11-12. The lack of port stops is a major issue for a ship the size and complexity of the USS Abraham Lincoln, experts say.

As US President Donald Trump and his defence secretary, Pete Hegseth, declare the United States is ready to continue an “indefinite” blockade on Iranian ports in the Gulf, we look at how this compares with other lengthy aircraft carrier deployments.

What is happening on board the USS Abraham Lincoln?

Reports by two US publications that cover military affairs, the Navy Times and Stars and Stripes, last week quoted family members of military personnel on board the vessel who said they were suffering from declining mental health and morale, and cases of suicidal ideation.

The Navy Times spoke on record with one sailor’s wife, identified as Annabelle Loma, who said he had attempted to jump overboard amid what she described as “severe burnout”.

The reports prompted urgent questions from US lawmakers. On Sunday, Admiral Brad Cooper, commander of US Central Command (CENTCOM), reportedly visited the USS Lincoln.

He praised the crew and stated on social media that “service at sea for long periods isn’t for everyone, while claiming the ship has the lowest number of mental health-related cases of the navy’s 11 active aircraft carriers. “It is uniquely challenging and tough, and every single one of us, including me, reacts to stressors in different ways,” he said.

But there is growing concern among Republican and Democratic lawmakers over what they see as a lack of accountability after Hegseth dismissed mental health reports last week as “completely misrepresented”.

When Trump was asked last week whether the USS Lincoln had been at sea for too long, he told reporters: “No, not nearly long enough.”

The USS Lincoln mission was supposed to end in May but has been extended repeatedly since then.

Last week, it emerged that another ship, the USS George Washington, has been rerouted from its position in the Pacific and will arrive in the Gulf within a week to take over duties from the Lincoln.

How long can US aircraft carrier deployments be?

The longest aircraft carrier deployment since the Vietnam War was the USS Gerald R Ford’s 326-day mission, which began in June 2025, under Trump’s second term in the White House.

That mission included NATO exercises in the Mediterranean, support for the US military operation that captured Venezuelan President Nicolas Maduro, and operations in the Red Sea during the US-Israel war on Iran.

After beginning its mission as a routine deployment to the Asia Pacific region, the Ford then moved into the South China Sea for security operations, before being deployed to the Arabian Sea and the Gulf of Oman to help the US enforce its naval blockade of the Iranian ports.

During this time, the USS Ford met several technical problems, including an onboard fire, which also triggered congressional scrutiny back home.

Lengthy deployments during the Vietnam War

Some of the longest aircraft carrier deployments in US history took place in and around the Gulf of Tonkin during the Vietnam War, with the USS Midway operating for 332 days, the USS Coral Sea operating for 329 days and the USS Saratoga operating for 308 days.

Similar to the USS Lincoln, they faced issues as well. Reports said the intense flight schedule of the active air combat during the Vietnam War pushed crew and operations to their limits.

While there are a number of lengthy aircraft carrier deployments from other countries, they pale in comparison to the US Navy’s record.

Russia’s Admiral Kuznetsov conducted a five-month mission to the Syrian coast which began in October 2016, but suffered several technical breakdowns, including aircraft losses.

The United Kingdom’s HMS Queen Elizabeth completed a seven-month deployment in 2021, which included combat strikes on targets in Iraq and Syria, despite significant breakdowns due to engineering issues.

Why is this issue so critical?

Many lawmakers have raised questions over whether the US can maintain an “indefinite” blockade in the Gulf if conditions on board a flagship aircraft carrier are so dire.

In a letter to Hegseth last week, Democratic Senator Richard Blumenthal raised the alarm over reports of deteriorating mental health on board, as well as shortages of basic supplies, water contamination, an increase in safety incidents and even disruptions to mail services, through which those on board receive care packages.

“These reports warrant immediate attention, but they also raise a broader question: whether the Navy can sustain the operational tempo now being demanded of its carrier force, particularly as this administration repeatedly commits US forces to conflicts of its own choosing and increasingly relies on aircraft carriers to sustain those operations,” Blumenthal wrote.

Experts say the lack of port stops is a major issue for the USS Abraham Lincoln.

Harlan Ullman, a retired senior naval officer and chairman of the strategic advisory firm Killowen Group, told Al Jazeera that ships require onshore care to keep advanced technology operational over long periods.

“Ships need maintenance, particularly ships that are extremely complicated with very advanced weapon systems such as nuclear-powered carriers with very advanced systems, and there are things that you cannot do in terms of maintenance under way,” Ullman said.

“There are lots of things that you can do at sea, but there are far more things that can only be done in port,” he pointed out.

Ullman noted that extended deployments “erode the readiness and capability of that ship the longer it’s at sea, and it lacks the ability to repair and extend maintenance”.

He added that the Trump administration must prioritise naval readiness over politics, saying “this is a national issue, not a local one; and the administration should not be so defensive. It should say, ‘OK, we’ll see what’s going on, and then if there are some issues, we’ll take care of them.’”

What are the drawbacks of deploying aircraft carriers?

Aircraft carriers are built to be on deployment for many months at a time. However, that comes with a high cost, as extended cruises increase the risk of technical breakdowns and can also lead to reduced staff morale and mental health concerns.

Large aircraft carriers are expensive. The USS Abraham Lincoln cost $2.2bn to build in 1989, and it costs tens of millions of dollars to operate on a daily basis.

Recent conflicts in the Red Sea have also underscored the vulnerability of large aircraft carriers. Houthi rebels, who do not possess a formal navy, have nevertheless managed to put significant pressure on large US Navy aircraft carriers operating near the limits of their missile range.

At one point during the US-Israel war on Iran, the USS Gerald Ford was forced to sail hundreds of miles away from the Iranian coast to reduce the risk of being hit by missiles, limiting its effectiveness.

EXPLAINER

Paris and other European cities are experiencing temperatures above 40C (104F), reaching levels normally seen across the Middle East.

A blistering heatwave has gripped much of Europe, prompting the highest-level red alerts in parts of the United Kingdom, France, Spain and Italy.

Authorities have warned of health risks, wildfires and travel disruptions as extreme temperatures persist.

With temperatures approaching record highs, officials have taken emergency measures, including a localised alcohol ban in parts of France under red alert, nationwide heat warnings in Germany and the cancellation of a World Cup fan zone screening in Madrid, where temperatures hit 39C (102F).

Why is it so hot in Europe?

A persistent area of high pressure, known as a heat dome, has trapped hot air over Western Europe, bringing clear skies, weak winds and prolonged sunshine. Hot air moving north from North Africa has added to the extreme temperatures.

Unusually warm seas around the UK, Ireland, France and the western Mediterranean have also helped keep coastal areas hot, especially at night. Coastal waters around Spain have reached record warm levels, according to Spain’s port authority.

In the worst-affected areas – western France, England and Wales – daily average temperatures have soared more than 12C above the 1991-2020 baseline, according to Copernicus data.

Scientists say the early-season heatwave is part of a broader warming trend. Europe is the world’s fastest-warming continent, with temperatures rising by approximately 0.56C per decade since the mid-1990s, more than double the global average.

Climate change is making heatwaves more frequent, more intense and likely to occur earlier and later in the year.

How hot are European cities today?

To contextualise the temperatures Europe is dealing with, Al Jazeera looked at the maximum temperatures in five European capitals on June 24 and compared them with cities across the Middle East, North Africa and Asia, where high temperatures are more typically experienced.

Europe is particularly vulnerable – much of its housing and infrastructure was not built for prolonged extreme heat, and only about 20 percent of European homes have air conditioning.

The graphic below shows how European cities’ maximum temperatures today compare with some other cities around the world:

How is temperature measured?

The temperature you see on the news or the weather app on your phone relies on a network of weather stations positioned around the globe.

To ensure accurate readings, weather stations typically use specialist platinum resistance thermometers placed inside shaded instruments known as a Stevenson screen.

Measurements are taken at a standard height of 1.25-2 metres (4-6.5 feet) above the ground. This provides a reading that reflects the air temperature that people actually feel.

There are two well-known scales used to measure temperature: Celsius and Fahrenheit.

Only a few countries, including the United States, use Fahrenheit as their official scale. Most of the world uses the Celsius scale, named after Swedish astronomer Anders Celsius, who invented the 0-100 degree freezing and boiling point scale, although originally inverted, in 1742.

Why does the temperature feel hotter than the forecast says?

Air temperature alone often doesn’t match how hot it feels to your body. That is why forecasts report a “feels like” temperature, which adjusts air temperature based on factors like humidity, wind speed and sun exposure.

Humidity

Humidity measures how much water vapour is in the air. This moisture slows the evaporation of sweat, so your body can’t cool itself as effectively.

Wind speed

In hot weather, a light breeze can help evaporate sweat, making it feel cooler.

Sun exposure

Even if the thermometer reads the same, direct sunlight adds extra warmth, which is why shaded areas feel cooler.