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
Tributes are being paid to two young men from Plymouth who died after apparently taking white heroin by mistake in Amsterdam.
One might argue that David Cameron has just given a speech about a problem that doesn't exist and it is definitely one he can't change.
The complex mix of marketing, merchandising and psychology that sees shoppers parting with £360,000 a minute in the UK's shops.