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A dolphins swims in front of Navy's newest submarine, the attack submarine USS John Warner, during its sea trials in May. The John Warner was commissioned on Saturday, August 1, in a ceremony in Norfolk, Virginia. Virginia-class attack subs, displacing 7,800 tons and at 377 feet long, "are designed to seek and destroy enemy submarines and surface ships; project power ashore with Tomahawk cruise missiles and Special Operation Forces (SOF); carry out Intelligence, Surveillance, and Reconnaissance (ISR) missions; support battle group operations; and engage in mine warfare, according to the Navy. The Navy has 12 Virginia-class subs in service. Click through the gallery to learn more about the Navy's submarine fleet.
A dolphins swims in front of Navy's newest submarine, the attack submarine USS John Warner, during its sea trials in May. The John Warner was commissioned on Saturday, August 1, in a ceremony in Norfolk, Virginia. Virginia-class attack subs, displacing 7,800 tons and at 377 feet long, "are designed to seek and destroy enemy submarines and surface ships; project power ashore with Tomahawk cruise missiles and Special Operation Forces (SOF); carry out Intelligence, Surveillance, and Reconnaissance (ISR) missions; support battle group operations; and engage in mine warfare, according to the Navy. The Navy has 12 Virginia-class subs in service. Click through the gallery to learn more about the Navy's submarine fleet.

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Inside the Navy's 'most lethal warship'

Get a closer look at the Navy's newest submarine, the USS John Warner.

Inside the Navy's 'most lethal warship'

Get a closer look at the Navy's newest submarine, the USS John Warner.