Pc Terry, a father of two from Burnley, Lancashire, was shot as the unit practised in a disused factory in Newton Heath on June 9 2008.
An inquest held at Manchester Coroner's Court in March 2010 found Pc Terry was unlawfully killed.
Greater Manchester Police has admitted a health and safety breach over the fatal shooting of one of its officers in a training exercise.
Pc Ian Terry 32, was killed during a firearms training exercise at a disused warehouse in June 2008.
Pc Terry's family attended Liverpool Crown Court today as Chief Constable Sir Peter Fahy pleaded guilty on behalf of GMP to a breach of Section 2 of the Health and Safety at Work Act (HSWA).
Two GMP firearms officers, who cannot be named for legal reasons, each denied one count of a breach of Section 7 of the HSWA.
The officers, a sergeant and a constable, will stand trial on June 10 at Manchester Crown Court.
The force will be sentenced on March 20 and 21 also in Preston Crown Court.
The Chief Constable of Greater Manchester has received his knighthood from the Queen.
Sir Peter Fahy was given the award in the Queen's birthday honours list in June. His knighthood marks his services to policing over a 30 year career.