Military chiefs have reviewed training for troops being sent to Afghanistan after a series of "green on blue" killings, the Government said tonight.

The latest British victim of an insider attack, when Afghan allies turn their weapons on coalition comrades, died yesterday at Patrol Base Shawqat in the Nad-e Ali district of Helmand province.

Captain Walter Barrie, 41, from Glasgow, of the Royal Scots Borderers, 1st Battalion The Royal Regiment of Scotland, is pictured here with his son Callum, 15.

He was shot dead by a rogue member of the Afghan army as he played in a football match on Remembrance Day and has been hailed as a "great man" by his wife tonight.

His wife Sonia said: "Walter was a great man, a doting and amazing father and a fantastic husband. He was much loved and will be missed by many. The family would ask that their privacy is respected during this very difficult time."

The death of Captain Barrie took the number of UK service personnel killed in Afghanistan since the start of operations in October 2001 to 438.

Twelve British servicemen have been killed by Afghan soldiers or police this year, compared with one last year, three in 2010, and five in 2009.

Defence minister Andrew Robathan said the surge in insider killings had led to changes in training before troops fly to the war-torn country.

He added: "UK armed forces deployed in Afghanistan constantly review their tactics, techniques and procedures in line with the roles they are undertaking, the situation on the ground and the latest threat assessments, and lessons identified are reflected back into training for future deployments.

"Combined patrolling is one aspect of our interaction with Afghan national security forces and, in response to the recent increase in insider attacks, we, Nato and the Afghan government have undertaken several initiatives to mitigate the risks, including reviewing our national pre-deployment training."

Mr Robathan, in a written parliamentary reply, refused to divulge further details for fear it would jeopardise security.