New Navy Ship-Defense Missile Destroys Target With High-Tech “Active Seeker” The ESSM Block 2 live-fire exercise marked the first use of the weapon’s active seeker system Kris Osborn · August 20, 2018 Please leave this field emptyStay Updated with Warrior Maven Subscribe for daily military news and updates delivered straight to your inbox. We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.