Speaking on a visit to British troops in Iraq, he said: "The changing character of warfare provides new challenges - not just about how we fight but also how we recognise and support those who serve.

"As fighting has evolved we have adapted, ensuring our troops have cutting-edge equipment including unmanned systems operated from outside the battlespace. Our recognition of service, the risks taken, and the long-term effects must therefore adapt too.

"That is why we need to examine how to provide medallic recognition for those making a vital contribution to Op Shader outside the battlespace, from Reaper pilots taking life-and-death decisions to those who ensure our planes can strike Daesh targets."

Sir Michael also announced the creation of an Operation Shader medal for those who have fought Isil, which he described as "the evil of our time".

The Defence Secretary said: "It is only right that those who've performed above and beyond in this fight against the evil of our time get the recognition they deserve. This medal will do just that.

"Our troops have made huge contributions to the fight against Daesh, helping end its tyranny in large parts of Iraq and Syria.

"They have conducted over 1,500 strikes against Daesh terrorist targets and helped train nearly 60,000 Iraqi Security Forces.