As is the case with most uniformed law enforcement agencies, the Los Angeles Airport Police has a paramilitary organizational structure. The rank structure has changed over the years. For example, Assistant Chief and Deputy Chief ranks were used from 1980 to 1986, but were dormant from 1986 to 2007. The rank of Commander (one star) is not currently(2011)in use. A four-stripe rank Sergeant, (with an added bottom rocker, similar to U.S. Army Staff Sergeant) was used from 1980 until 1986 to differentiate active sergeants from other sergeants who had previously served in Boarding Service Bureau at a lower paygrade. Field Training Officers, Detectives and K9 officers receive a 5.5% bonus for those duties.