A British Army corporal has been court-martialled after ignoring a direct order to remove the SIM card from his phone before deploying to Estonia, a security lapse that ended with intimate photographs taken from the device and used to blackmail him.

Daniel Barton-Kennedy, who had served in the Army for seven years, was deployed to Estonia in January 2026, to a posting about 90 miles west of the Russian border. Before deploying, he was ordered to remove his SIM card, switch off location settings and use a trusted virtual private network. The measures are part of the operational security rules that apply to troops serving close to a potential adversary, designed to stop personnel being tracked, identified or targeted through their personal devices.

According to reporting of the case, Barton-Kennedy kept his phone active. An unknown person obtained nude photographs from his phone and identified him on social media, then threatened him with them. On 19 January he reported the matter to his platoon commander. He initially paid the blackmailer £100, but refused a further demand for £250 and reported the compromise.

Barton-Kennedy was court-martialled for disobeying a lawful command. He pleaded guilty at a hearing on 30 July, was reduced in rank and ordered to serve 10 months in detention. He told the court that he understood the order he had been given, but asked it to consider the personal circumstances he was facing: without his mobile phone, he said, he was unable to contact his daughter on her birthday or his pregnant partner. He later appealed, and the appeal was dismissed in August 2026.

A British Army spokesperson, Lieutenant Colonel EP McKee, said the security measures imposed on deploying troops are intended to protect military personnel, and that violations of Army security measures that could compromise personal or operational security can be swiftly addressed, with offending personnel facing uncompromising disciplinary action.

The case was first revealed by an Estonian newspaper and reported in Britain on 7 November. British forces have led NATO's enhanced Forward Presence battlegroup in Estonia since early 2017, serving alongside allies on the alliance's eastern flank, where personal-device discipline is treated as a live security issue rather than an administrative detail.

The court-martial is a reminder of how quickly a personal security failure on deployment can become a disciplinary and a security problem at once. No information has been published identifying the blackmailer or attributing the theft of the photographs to any state or group.