President Donald Trump is expected to announce Deputy Secretary of Defense Patrick Shanahan as acting secretary of defense as of January.
Brett McGurk, the special envoy for the global coalition to defeat Islamic State, submitted his resignation on Friday.
Administration of Donald Trump sought to persuade US lawmakers to maintain America's increasingly contentious backing of Saudi Arabia in the war in Yemen.
The United States and South Korea have scaled down a joint military exercise scheduled for the spring of 2019 to facilitate nuclear talks with North Korea.
The US-led air strikes against the Syrian regime also sent a message to North Korean leader Kim Jong Un ahead of talks with President Donald Trump.
Turkey said on Thursday it had demanded the United States expel a Kurdish militia from forces it backs in Syria.
U.S. Defense Secretary Jim Mattis said on Friday that he expected to see a larger U.S. civilian presence in Syria.
US Defense Secretary Jim Mattis said Friday he does not see the need for a stepped-up military posture against Iran.
Jim Mattis said that analysis continued on North Korea's most recent missile test, but he did not believe its (ICBM) posed an imminent threat to the U.S.
US Defense Secretary Jim Mattis arrived in Pakistan Monday as Washington pressures its wayward ally to eliminate militant safe havens.
Egyptian Defense Minister Sedki Sobhi discussed Saturday counterterrorism cooperation with his U.S. counterpart Jim Mattis.
Jim Mattis said that he still had confidence in diplomatic efforts on North Korea and the U.S. would be "unrelenting" in working through the United Nations.
US Defense Secretary Jim Mattis said that a US-led coalition will forge ahead in its fight against Daesh terrorist group in Syria and Iraq.
U.S. Defense Secretary Jim Mattis said on Saturday that the United States would never accept a nuclear North Korea.
Washington's goal "is not war" as it seeks to ease high military tension with Pyongyang, US Secretary of Defense Jim Mattis said Friday.
US Secretary of Defense Jim Mattis will visit South Korea this week for annual security talks between the allies.
U.S. Defense Secretary Jim Mattis said on Thursday the U.S. military did not have all the accurate information on an ambush in Niger.
U.S. Defense Secretary Jim Mattis said on Friday that United States is working to ensure tensions around Kirkuk do not escalate.
Jim Mattis said he was hopeful that the freeing of a kidnapped U.S.-Canadian couple and their three children in Pakistan was a harbinger for closer cooperation.
Jim Mattis on Wednesday slammed what he said were "absolutely false" media reports asserting that Trump had called for an increase in the U.S. nuclear arsenal.