Former SAS sniper Sergeant Danny Nightingale will begin giving evidence in his court martial in Wiltshire later today.
Sergeant Nightingale is accused of the illegal possession of a Glock 9mm pistol and 338 rounds of ammunition, which were given to him after leaving Iraq in 2007.
Earlier, the court martial heard how the firearm and ammunition were in found in the former soldier's accommodation in 2011.
Nightingale's previous conviction for the same charges was quashed by the Court of Appeal on 13 March.
More top news
Six people have begun living in a dome in Hawaii to simulate what life would be like on Mars.
The 12th series of X Factor kicks off on ITV this Saturday but which previous winners went on to make it big?
A mother and her four young children who are feared to be travelling to Syria are being sought by police.