Are U.S. airstrikes on al-Qaeda in the Arabian Peninsula effective at reducing al-Qaeda in the Arabian Peninsula initiated attacks? Airstrikes have been a popular counterterrorism tool in the Obama and Trump administrations. However, the effectiveness of airstrikes has been contentious. Using ACLED data from 2016-2019 I estimate a series of negative binomial regressions. I first assess the effect of airstrikes generally and find that airstrikes are effective at reducing AQAP attacks. I then disaggregate my airstrike variable to examine the effects of militant casualties, leadership casualties, and civilian casualties independently. I find that civilian casualties and leadership casualties have no effect on AQAP attacks while militant casualties have reduced AQAP attacks.