I suggested the "drill instructor" was being silly if he was looking for the answer to be "that one DME ARC IAP."

I disagree.

To bust somebody on a question like that would have been more than
silly. However, =asking= the question, as a "bonus question", is a way
of examining people's unstated assumptions about flight and the
environment in which we aviate. This is always a good thing.

Jose
--
The price of freedom is... well... freedom.
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