After serving as offensive line coach the last two years, Bill Callahan has had assistant head coach added to his title. (AP Photo/David Richard)

The Redskins announced on Wednesday that they have finalized their coaching staff for the 2017 season after promoting three assistants and adding another.

Jay Gruden has promoted offensive line coach Bill Callahan to the role of assistant head coach, and Callahan will also continue to coach the offensive line. Gruden also has promoted Chad Grimm to outside linebackers coach. Grimm, the son of Redskins Hall of Fame offensive lineman Russ Grimm, had worked as a defensive quality control assistant the last two seasons.

The Redskins promoted special projects coach Bret Munsey to assistant special teams coach. Munsey has been on staff with Washington since 2014.

Washington also added offensive quality control assistant Chris O’Hara. O’Hara spent the last three seasons as an offensive coaching associate with Jacksonville.

“We’ve assembled a staff of quality teachers and quality people,” Gruden said in a press release. “As a group, we’re excited to work together to achieve our goals for the 2017 season.”

Gruden this offseason had to retool his coaching staff after firing defensive coordinator Joe Barry, defensive backs coach Perry Fewell, defensive line coach Robb Akey and strength coach Mike Clarke, and after losing offensive coordinator Sean McVay to the L.A. Rams’ head coaching position and assistant defensive backs coach Aubrey Pleasant to the Rams’ cornerbacks coaching position.

Gruden promoted quarterbacks coach Matt Cavanaugh to offensive coordinator and hired Kevin O’Connell as quarterbacks coach. He promoted outside linebackers coach Greg Manusky to defensive coordinator, hired Jim Tomsula as defensive line coach, Torrian Gray as defensive backs coach and James Rowe as assistant defensive backs coach. The Redskins also promoted Chad Englehart to head strength and conditioning coach and hired Kavan Latham as his assistant and Cannon Matthews as defensive quality control coach.