An entry in the Nov. 10 column incorrectly stated the number of airstrikes the United States has conducted against ISIS targets in Iraq and Syria. The number is 6,257. Coalition forces other than the US have conducted 1,735. We have corrected the entry here.
Northrop Grumman test fired its newest solid rocket motor Dec. 4, part of an internally funded effort to rapidly design and build SRMs using advanced manufacturing techniques.

