D.C. Fire and EMS Chief Gregory Dean is set to announce some major changes for the department's command -- including some of the highest ranking officials, sources tell News4.

Dean will re-assign two of his deputy chiefs, moving them away from day-to-day operations and replacing them.

The president of the DC Fire Fighters Association, Ed Smith, will also be made a battalion chief, which will mean new leadership for the firefighters union.

Smith is credited with winning firefighters thousands of dollars in back pay during a recent contract dispute.

Dean is expected to announce the changes in early September.

A spokesperson for Dean told News4, "Chief Dean is in the annual staff review process."

The moves come as Dean and Mayor Bowser have been working to improve the public image of the department.