About one-sixth of the bombs used by insurgents in January ended up wounding or killing troops compared with the one-quarter of such bombs that caused casualties in August, according to figures from the Joint Improvised Explosive Device Defeat Organization, the Pentagon's agency for combating makeshift bombs.
Fantastic. I smiled. Then I read this...
"The challenge is to keep the American casualty rate at a sustainable level for the next several years that we'll need to get the Afghan army trained to take over security."
... and I wanted to cry.
http://www.usatoday.com/news/world/afghanistan/2011-02-17-1AIED17_ST_N.htm