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[EOR]
[BOC]
For the most part, it was because the Allies thought their codes were strong enough. While they had broken most Axis codes, they were unaware that their own had been broken, and so saw no need to change it. 

Also, the Royal Navy did want to switch over to the much more secure Typex machine, which was in use with the RAF and Army. However, the Typex machine was slow to produce, and much of the production was needed by the other services. As a result, the Navy had to wait until 1943 to fully adopt Typex.
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