Senior Chief Sonar Technician (Surface) Ryan Markham and Sonar Technician (Surface) 2nd Class Bradley Espinosa explain anti-submarine warfare (ASW) aboard the Arleigh Burke-class destroyer USS Howard (DDG 83) June 16, 2021. Howard is currently underway conducting routine maritime operations in U.S. 3rd Fleet. (U.S. Navy video by Mass Communication Specialist 2nd Class Jason Isaacs)