• The UK is an active and regular participant in NATO and other coalition operations • Britain remains one of five recognised nuclear powers, with a total of 225 nuclear warheads Royal Navy • The Royal Navy is a technologically sophisticated naval force, and as of April 2015 consists of 77 commissioned ships • The Surface Fleet consists of amphibious warfare ships, destroyers, frigates, patrol vessels, mine-countermeasure vessels, and other miscellaneous vessels • A submarine service has existed within the Royal Navy for more than 100 years • The Submarine Service's four Vanguard-class nuclear-powered submarines carry Lockheed Martin's Trident II ballistic missiles, forming the United Kingdom's nuclear deterrent Royal Marines • The Royal Marines are the Royal Navy's amphibious troops • Contained within 3 Commando Brigade are three attached army units; 1
As a coun- termeasure for such errors, external safety measures must be provided to en- sure safety in the system. xvi Operating Environment Precautions 4 • The PC outputs may remain ON or OFF due to deposition or burning of the output relays or destruction of the output transistors. As a countermeasure for such problems, external safety measures must be provided to ensure safety in the system. • When the 24-VDC output (service power supply to the PC) is overloaded or short-circuited, the voltage may drop and result in the outputs being turned OFF. As a countermeasure for such problems, external safety measures must
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