Just a quick thought:
- UK Troops in Afghanistan - 9,500
- US Troops in Afghanistan - 65,000
- UK deaths to date - 234
- US deaths to date- 920
I've assumed that both rotate troops into theatre at the same frequency and have been out there for the same time period (sure it's not exact, but it'll do).
The ratio between UK and US forces is 1:7 but the ratios of terminal casualties has been 1:4.
Does this seem right to you?