U.S. Transportation Secretary Sean Duffy says it is “unacceptable” that two commercial aircraft had to abort landings at a Washington airport this week because of an Army Black Hawk helicopter that was flying to the Pentagon.

The episode followed a fatal collision between a military helicopter and a commercial jet in January, and prompted concern and outrage among officials.

Col. Gabe Pryor, the commander of the McAlester Army Ammunition Plant, served as the guest speaker of McAlester’s annual Armed