Around 250 soldiers from The King's Royal Hussars (KRH), many of them from Lancashire, will march through Leyland today.
An Iraqi hotel owner, who was beaten and abused by British soldiers, says the army medic who examined him is "a criminal".
An army medic will face allegations today that he helped cover up the mistreatment of Iraqi detainees.
An Iraqi detainee, abused by British soldiers, is giving evidence in a General Medical Council (GMC) case against a doctor accused of helping to cover up such abuse.
The GMC say army medic Dr Derek Keilloh was dishonest about the injuries suffered by detainees he was caring for. He denies the allegations.
The hearing has listened to the joint owner of a hotel when British soldiers raided it and arrested him in 2003.
The hotel's receptionist, Baha Mousa, was among those arrested. Mr Mousa died after being abused in British custody. He had 93 injuries.