unarmed non-sworn Security Officers wore the same uniform as the sworn officers until 1999, when they reverted to the sheriff-style green/tan combination, partly as an identification measure during emergency situations. Black Nomex uniforms are worn by officers assigned to K-9 duties. Additionally, blue BDUs are issued to all sworn officers and are worn as a work/utility uniform as well as an Emergency Services uniform. Badges do not have "Los Angeles" included as part of the lettering, other than in very small type on the City Seal. It was felt that the inclusion of the LAX Theme Building and control tower would be distinctive enough to identify which Airport Police was being represented by the badge Rank structure 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. In 2011, the rank of Commander was not 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 bonus for those duties. Security Officers have their own rank structure for first and second level supervisors. Senior Security Officer is considered to be the functional equivalent of a sergeant, while Principal Security Officer is considered to be the functional equivalent of a lieutenant. However, neither has any operational authority over sworn officers. Other civilian (non-sworn) employees have their own supervisory ranks, depending on position and job classifications. For instance, Senior Communications Operators supervise Communications Operators. Sworn supervisors may supervise both sworn and non-sworn employees; however, civilian (non-sworn) supervisors do not supervise sworn employees. The LAXPD issues service stripe to officers in the form of hash marks. One hash mark denotes five years of service. Civilian oversight As an autonomous organization subordinate to LAWA, civilian oversight of the LAXPD is through the LAWA chain of command. Prior to 1999, the chief of police at LAX reported to the LAX airport manager. That relationship changed when the chief of police was placed on par with the airport manager in the LAWA structure. Starting in 1999, the