Over here in the UK the press are busy misrepresenting what he said and then attacking that straw-man.
He said he was good at video games and that this translated into a skill with the Apache weapons systems. This is actually quite uncontroversial. For some time it has been widely discussed in the Royal Air Force that the next generation of pilots will be better skilled because of their computer game experience as teenagers.
When subsequently asked if he had killed he said yes. Which is reassuring because as both a British tax payer and a soldier I would like my AAC Apaches to kill.
However, because the press hate him (mainly because we all like him) they then reported that Harry said killing people is like playing xbox.