to a power failure, an operator had to set the current hour and minute on dials on the front panel. The KWR-37 would then "fast forward" through its key stream sequence until synchronization was re-established. Large numbers of fleet broadcast key cards had to be produced and distributed to every navy ship and many shore installations on a monthly basis, so many people had access to them. While the key cards were strictly accounted for, they were easy to copy. This proved to be a fatal weakness. KWR-37s fell into North Korean hands when the USS Pueblo was captured in 1968. New keying material was issued to ships throughout the world to limit the ongoing damage. In 1985 it was revealed that the Walker spy ring had been selling key lists and cards to the Soviet Union for decades. KW-37 systems were taken out of service by the early 1990s. The received input to the KW(R)-37 was in the form of a multiple broadcast (multicast) signal, consisting of many channels condensed into one tone pack which was deciphered at one stage by the KW(R)-37 and then the output was sent to several KG-14's which further deciphered the then split signals into each channel of the fleet broadcast. The KG-14 also received its timing signal from the KW(R)-37; if the 37 was out of sync, all the 14's were fall out of sync as well. Each KG-14 could process one channel of the tone pack; most fleet units had six KG-14's, larger units even more. Experiences operating the KWR-37 Typically, fleet units utilizing the KWR-37 units were outfitted with two devices for redundancy. Should one unit fail, the other one would already be online and patches via a high level, 60-milliamp patch panel would quickly be changed around so that the current offline unit could be changed over to online status at a moment's notice, to ensure that there was no interruption of message traffic. Later in their life, when KWR-37 units were aged and worn, sometimes the circuit cards inside had to be reseated with a rubber mallet which helped ensure the cards were seated properly. Other problems with the KWR-37's were related to the startup times. Fleet radiomen, and those stationed in the shore transmitting stations, had to listen to an HF signal for coordinated universal time. Radiomen called this broadcast the "time tick," which gave them a sharp