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8 VC awards were forfeited for various crimes (theft, bigamy, desertion &c) until ...
... King George V said in 1920 that, no matter the crime committed by anyone on whom the VC has been conferred, the decoration should not be forfeited. Even were a VC to be sentenced to be hanged for murder, he should be allowed to wear his VC on the scaffold.
Thus no VCs has been forfeited since 1908.
As of 2014, six people have been removed from the Order of Canada. However, Order of Canada appears to be more similar to an honorary society (such as an academy of sciences) than a military decoration (as it recognizes a "lifelong contributions" as opposed to "acts of valour", and thus future misdeeds matter more).
It appears that there are no examples of any of the following decorations revoked on the basis of the recipient's misdeeds:
However, a Silver Star has been revoked after a conviction for possession of child p**nography (this episode could have been politically motivated).
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In Norway the practice has varied for different awards. Military decoration such as the War Cross was from the start supposed to be revoked if the awardee later proved to be unworthy (to date no award has been revoked).
For civilian decoration there has until recently been a separation between orders and medals. The Order of St. Olav awarded prior to 1940 was revoked for persons found guilty of treason during the war (1940-45). However this was not the case for the Royal Medal of Merit where the possibility of revoking an award first was introduced in 2012.