Acting Pentagon chief Patrick Shanahan has authorized $1 billion to build part of the wall sought by Donald Trump along the US-Mexico border, the first funds designated for the project under the president's emergency declaration.

Now that the Islamic State group has officially lost its geographic "caliphate," the Pentagon is marking a historic moment in its years-long campaign to defeat the jihadists.

Turkish Defence Minister Hulusi Akar told Pentagon officials during a visit to the United States that there must not be a vacuum of power during the withdrawal of US forces from Syria, state-owned Anadolu news agency reported on Saturday.

The acting US Secretary of Defence Patrick Shanahan arrived in the Afghan capital for an unannounced visit on Monday, meeting with top officials from NATO and the government.

Acting Pentagon chief Patrick Shanahan arrived in Afghanistan on an unannounced visit Monday as the United States leads a push for peace talks with the Taliban.

The Pentagon has identified about 7,000 troops that could be deployed to the border with Mexico if needed, a US official told Reuters on Wednesday.

The Pentagon grounded the global fleet of F-35 stealth fighters on Thursday, as a result of the first ever crash of the costliest plane in history.

US Defense Secretary Jim Mattis was not caught off guard by President Donald Trump's announcement that he was suspending military exercises with South Korea, a Pentagon spokeswoman said on Tuesday, adding he was consulted ahead of time.

President Donald Trump has ordered the Pentagon to prepare options for reducing the number of US troops in South Korea, the New York Times reported on Thursday, citing several people briefed on the deliberations.

The US Department of Defence has identified a soldier who was killed in combat in Afghanistan's eastern Kapisa province on Monday.

The United States said on Saturday it overwhelmed and evaded Syrian air defences overnight to strike every target at the heart of Syria's chemical weapons program, in a multi-pronged attack from the air and sea ...

German Interior Minister Horst Seehofer said on Saturday he would press for ‘reasonable results’ in the next round of pay talks with more than two million public sector workers ...