vehicle crime. Offender management unit (OMU) All ten LPUs have an offender management unit (OMU) who work with partner agencies to concentrate on the offenders living on their areas identified as being particularly difficult or damaging. Offenders who fall into this category include those designated as prolific and other priority offenders (PPOs), drug users, violent criminals and young criminals. Officers from the OMU manage their assigned PPOs under two strands. One consists of rehabilitation and resettlement under which partner agencies are involved in an effort to halt re-offending whilst the other consists of catching and convicting offenders who have been identified as not participating in rehabilitation programmes or are wanted for outstanding crimes. Operational support unit (OSU) Working from Park Lane the operational support unit is a team of officers specially trained in areas including Public Order policing, method of entry and searching. Officers working with the OSU are typically deployed as part of a "serial" of one sergeant and seven officers and have access to specialist equipment and vehicles including armoured land rovers. Public protection unit (PPU) The public protection unit (PPU) investigates reports of sexual assaults and incidents involving children and vulnerable people. PPU is split between adult and child investigations, is responsible for safeguarding and works with partner agencies such as social services and domestic violence charities. As with CID, most officers working in the PPU hold a detective qualification. Safer travel The safer travel team is a collaboration between West Midlands Police, the British Transport Police and CENTRO, focusing on criminal activity occurring on the public transport network. The team is composed of officers and PCSOs who patrol trains, buses and trams in the region. The Partnership, the first of its type in the country, also has access to around 1,000 CCTV cameras which are located at bus, rail and metro stations, park and ride sites and in bus shelters. The dedicated control centre is staffed 24 hours a day to spot and respond to incidents. Professional standards department (PSD) Based at Lloyd House, the professional standards department (PSD) is responsible for the recording and assessment of public complaints about police officers, police staff or special constables. PSD also has a role in investigating serious reports of misconduct and corruption involving members of the force. Members of the public are eligible to make a complaint if the behaviour about which they want to complain was directed