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U
U
U. S. Controlled Facility
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UA
UBD
UDP datagram
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Unavailability
A measure of the degree to which a system, subsystem, or equipment is not operable and not in a committable state at the start of a mission, when the mission is called for at an unknown (random) point in time. Expressed mathematically, 1 minus the availability. Note: The conditions determining operability and committability must be specified. See also availability.
