In reply to Kimono:
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> A tricky one...
NOT F3CKING TRICKY AT ALL.
Every single person in the British armed services is subject to international and domestic law. Everyone is regularly instructed on the Law of Armed Conflict, based on JSP383 and the laws to which it refers.
You, or any other person, here or abroad, can read that document by downloading it from the following address.
https://www.gov.uk/government/collections/jsp-383
During a firefight, the law still applies. When the firefight is over, and the British are in control, any person, captured injured or fully fit, no matter what their allegiance, race, colour, politics, or any other characteristic, should be able to expect a standard of treatment as set out in international law as a minimum.
In the hands of any Council of Europe state, they should be able to expect a significantly higher standard of treatment, in keeping with the European Convention of Human Rights.
In the UK, the High Court, in London, in December 2004, decided that the ECHR applied wherever the British have control. In the particular case that judgement involved, the scene was a prison in Iraq.
The convicted person in this case is a senior non-commissioned officer who should have been in a position of leadership on these same points. Instead, not only did he commit the crime but he openly stated to witnesses, as recorded, that it was a crime.
His ultimate boss is in no doubt about this matter.
http://www.bbc.co.uk/news/uk-24888089
And his predecessor is the same.
http://www.theguardian.com/uk-news/2013/nov/09/royal-marine-court-martial-m...
I have known people who have shot the wrong person accidentally while on active service, while trying to do their best, and did time for it. The marine in this case was a long long way from trying to do his best.