When does The Unit return?

The Unit is an American action-drama television series that aired on CBS from March 7, 2006, to May 10, 2009. It starred Dennis Haysbert, Regina Taylor, Scott Foley, Audrey Marie Anderson, Max Martini, Abby Brammell, Demore Barnes, Michael Irby, and Nicole Steinwedell. The Unit was one of CBS' most successful series, earning high television ratings and was nominated for a Primetime Emmy Award. The show purports to describe the daily lives of Delta Force operators during training and operational missions.
The Unit was created for television and executive produced by David Mamet and Shawn Ryan. The show purports to describe the daily lives of Delta Force (called "The Unit" in the show) operators during training and operational missions. The Unit premiered on October 3, 2006, in the United Kingdom on Bravo.