Department of Defence chief of staff Rear Adm. Kevin Sweeney resigned on Saturday, following other high-profile Pentagon departures.
Officials have said there is no timetable for the troop departure.
Mr Mattis, who worked with Mr Sweeney when he led the US Central Command, picked him to be his chief of staff in early 2017.
Rear Adm Kevin Sweeney is the third senior Pentagon official to resign after President Trump's Syria announcement.
Sweeney said a statement that he "decided the time is right to return to the private sector".
Tway beats pain to take early lead
DeChambeau had said he would take advantage of the new rule that allows the pin to be left in for putts on the green. Rory McIlroy birdied three of his last four holes for a 69 in his first competitive round on the Plantation course.
Federal agencies told to hold off pay raises
Congressional leaders are set to meet with Trump at the White House on Friday for a second time this week to discuss the shutdown. Raises that have accumulated in the intervening years will then be applied to the paychecks issued for top officials next week.
In a terse resignation letter, he said it had been an "an honour to serve" alongside his colleagues in the department, but made no mention of Mr Trump. Pentagon spokesperson Dana White has also stepped down as of last week.
Mattis announced his resignation following Trump's decision to withdraw USA troops from Syria.
No reason was given for Sweeney's departure, which was announced five days after the formal departure of Defense Secretary James Mattis.
While Mattis meant to stay in his role until February, U.S. President Donald Trump announced shortly after that an interim defence secretary would take over the post in January instead.
Hurns, who joined the Cowboys this season, was hurt in the opening quarter after making a 14-yard catch on third down. He was efficient with his throws, but the biggest plays of the game came on the ground. "They keep us in every game".
In terms of his impeachment resolution, Sherman said, "There is no reason it shouldn't be before the Congress". Rashida Tlaib used an expletive Thursday in pushing for impeaching President Donald Trump .
He is getting his rhythm back. "Isco is so good he can play wherever, in any position on the pitch", Solari said. He also earned a first trophy as a coach by winning the FIFA Club World Cup in December.
For the Huskies (11-1), it was their final game before American Athletic Conference play begins Sunday in Houston. I said before the start of the season it's not going to be a typical [season where] UConn comes in and wins by 40.
This prayer meeting was to remember Jazmine Barnes , her family and how God will see everyone through this tragedy. A US$100,000 (NZ$148,434) reward was being offered for information leading to an arrest in Jazmine's case.
He still has interest from other teams including Cincinnati and Miami, and Bieniemy turned down an interview with Arizona. Another season of failing to live up to expectations has ended Todd Bowles' stint as head coach of the New York Jets .
Pope Francis originally had suggested the bishops make a retreat in November instead of holding their annual general meeting. The pontiff also warned against reducing the church's mission to the administration of an "evangelisation business".
Hervé Berville (député en Cotes d'Armor) et Laetitia Avia (Paris), cités dans la lettre, ont également réagi sur Twitter. L'expéditeur accumule les propos racistes d'une extrême violence et menace le député de mort.
The Quadrantids meteor showers have already been shooting across the skies since December 22, and will continue until January 17. The stellar show is falling during a new moon, meaning the sky is darker and the meteors will be more easily visible .
Mallya declared fugitive economic offender!
The hearing with regard to the confiscation of his assets will take place in the special PMLA court on 5 February. Despite being bankrupt, he was given loans and his loans were even restructured.
Broncos will not consider Adam Gase for HC job
This season, the Dolphins finished 29th in total defense (391.1 yards per game) and allowed a franchise-worst 6,257 yards. Gase, 40, is an offensive mind, something the Jets are hoping to land to help develop quarterback Sam Darnold.
France’s ‘yellow vest’ protestors back on the streets
This weekend some of the protesters were told by organisers to leave their yellow vests at home to better evade the police. My daughter earns 800 euros ($911) a month. "For her, it's about surviving", said one protester, 58-year-old Ghislaine.