Two serving soldiers have pleaded guilty to robbery and weapons charges.
Grenadier Guardsmen Dillon Sharpe, 22, and Elnur Bracegirdle, 20, were arrested after a convenience store in Brixton, south London, was targeted in the early hours of January 10.
Both admitted carrying out the robbery for money when they appeared at Kingston Crown Court by video-link from Wandsworth prison on Thursday.
Sharpe pleaded guilty to possessing a stun gun disguised as a torch, while Bracegirdle admitted carrying a knife at the time of the offence.
Bracegirdle denied possessing a prohibited weapon and Sharpe pleaded not guilty to having a bladed article on the same date.
Sharpe also admitted two further counts of robbery, two of attempted robbery, and four charges of possession of an imitation firearm after four other convenience stores were targeted across south London over four days in February last year.
The charges state he stole or tried to steal money and scratch cards.
Sharpe pleaded not guilty to a further three robberies, three attempted robberies and seven charges of possessing an imitation firearm in relation to a string of offences alleged to have been committed with a third soldier, Kristopher James-Merrill, 19, in July last year.
James-Merrill, from Brixton, who appeared in the dock wearing a smart dark three-piece suit, white shirt and tie denied the same charges.
The three men accused over a total of 12 robberies or attempted robberies on a 25-count indictment are soldiers in the 1st Battalion Grenadier Guards and are believed to have been based at the Lille Barracks in Aldershot, Hampshire.
The regiment is one of the most senior in the British Army with its soldiers known for their scarlet tunics and bearskins as they carry out ceremonial duties at Buckingham Palace and Windsor Castle.
Judge Georgina Kent set a date of July 1 for a two-week trial.
Sharpe, from Dulwich, south-east London, and Bracegirdle, from Preston, Lancashire, were remanded in custody, while James-Merrill was released on bail.