Timelines like this express the milestones of a policeman's career in an easily understandable, chronological diagram.
Text in this example:
April 1998 Starts Cadet Training
May 1999 Makes First Arrest in the Field
Sept. 1999 Makes Police Sergeant
Feb. 2000 Transfers To Uptown
Sept. 2000 Makes Lieutenant
Jan. 2001 Celebrates his 200th Arrest!
May 2002 Promoted To Headquarters
Jan. 2003 Makes his 300th Arrest
Jan. 2004 Celebrates the Arrest of Crime lord "Slick Jim"
Feb. 2005 Makes 25th Courtroom Appearance
Oct. 2005 Move into Headquarters, Permanently out of the field.
Oct. 2006 Re-designs Office Promoted to Captain
March 2007 Transfers to California
Feb. 2004 Celebrates the Arrest of Crime lord "Slick Jim"