That said, the issue here is not how lethal one is over the other, but Google playing judge,jury and executioner for something they should have no right to jurisdict over.
United States: 4.8
United Kingdom: 1.2
http://en.wikipedia.org/wiki/List_of_countries_by_intentiona...vacri's statement seems completely accurate.
4.8 murders per 100,000 in the US vs 1.2 per 100,000 in the UK.
The figures _do_ take size into account.
Murders in the US are currently sitting at 14k, ~11k of which are from firearms. The US only has 5 times more people than the UK, which would turn your stat into a rough US-equivalent of 1.7k.
Good news is that their soldiers will have guns, and you can get a good advantage on them by staying in close quarters environments with your knifes.