The Pentagon revealed the location Monday of one of the US Navy’s most secretive vessels – a stealthy, nuclear-armed submarine – a day after President Trump rejected Iran’s latest peace offer .  The Navy’s Sixth Fleet shared an image of the Ohio-class submarine and its crew docked Sunday in Gibraltar, a British territory off Spain’s southern coast.   The Ohio-class submarine is capable of launching ballistic missiles with nuclear warheads. U.S. Navy “The port visit demonstrates US capability, flexibility, and continuing commitment to its NATO allies,” the Sixth Fleet said in a press release.  “Ohio-class ballistic missile submarines are undetectable launch platforms for submarine-launched ballistic missiles, providing the US with its most survivable leg of the nuclear triad,” the fleet added.  The Navy, which operates 14 nuclear-powered and nuclear-armed Ohio-class submarines, did not share the name of the vessel docked in Gibraltar.  The submarine’s Trident II ballistic…