By Susan Glasser
The opinions expressed are her own.

Last month was the deadliest for U.S. troops in Afghanistan in the ten years of the war there, with 67 killed, nearly half of them Navy SEALs in the downing of a Chinook helicopter — the deadliest single incident in this, the longest war in American history. More promisingly, it was also the first month since the American invasion of Iraq in 2003 that not a single U.S. soldier was killed there.