But there were at least 10 times more soldiers than officers. That means officer's death risk was at least 3 times higher than soldier's. They also mention that average IQ of a soldier that died was 95.

As someone who doesn't know much about military strategy, I find it surprising that officers are more likely to die in combat (or were in WWII, at least). Isn't it enlisted guys who ride at the tip of a dangerous advance?

Officers are the most targeted, that why the officer's uniform recently looks very much like soldier's - to make them harder to snipe.

Another breakdown is needed, but my guess is that it is air force pilots and bomber crew that skew the stats. Read/see "catch 22".

Most officers in WW2, certainly in Britain, were enlisted rather than career officers. This particularly applies to the lower ranks of officer, such as captain and lieutenant.

Leading from the front was common, for officers up to the rank of General, because it was the best way of knowing what was going on. There was no "blue force tracker" in those days!)

But Sergeants and Corporals are non-commissioned officers, and they are fighting in the muck with the rest of the enlisted soldiers.

If you consider the size of the average squad led by these non-coms (certainly larger than 5 people), then 20% of deaths is still probably not too good, but from what I know these people don't lead from behind.

Officers made up 7%. A non-commissioned officer is simply an enlisted person that has stayed in service long enough to be promoted. Commitment is in no way indicative of intelligence. In some cases it's the opposite.