I see this asked about sometimes. A lot of people think that the Duff in No Duff is a version of Guff, as in No Guff. In fact the term comes from the old days of radio warfare where instead of instant pinpointing of radio signals that we can do today, another technique was used which was known...
I have done the ACSO training before and passed it (though I was a level 6 which was the lowest pass category). It is really a case of listening to the advice of others. There is very little which can be done to prepare for it. A review of some high school arithmetic would be helpful, but...
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