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A year after Corrie McKeague went missing, Suffolk Police have told ITV News Anglia that their investigation has been "thorough" and "meticulous."
Despite no sign of the RAF gunner, Detective Superintendent Katie Elliott says she hopes Corrie's mother Nicola Urquhart "does not feel let down by the investigation " and was confident in the way it had been handled.
It comes as Nicola appealed for the public to join her saying "now is not the time to give up" on the search for her son.
She said her family would visit the first bar Corrie went on a night-out near his barracks in Bury St Edmunds on September 24 last year and retrace his last known footsteps.
Detectives fear Corrie was crushed in a bin lorry and taken to a rubbish tip after falling asleep in an industrial bin following a night out.
His family reacted with fury after police announced a tortuous 20-week search for his remains at the tip in Milton in Cambridgeshire costing more than £1.2m ended in July.
CCTV shows his last movements disappearing into a dark alley in the 'horseshoe' shopping area before his mobile phone signal matched the a bin lorry's route to the site.
But cops had sifted through more than 6,500 tonnes of waste but found "no trace" of Corrie.
Meanwhile his girlfriend April Oliver, 21, announced she had given birth to his baby girl Ellie-Louise Oliver, in June.
An independent review is due to be carried out over the next steps of the police investigation.