I'm inclined to the False Negative Rate.

Methinks an enterprising REME craftsman found the sights on this rifle were slightly out of whack when it was in a training Battalion. It was found that the sights were OK, you just needed to sort out the difference between a low 6 O'clock hold, a high 6 and a centre hold. The difference being the 'perceived' level of colour the shooter sees between blade and target.

The Crafty, liking a joke, decided that A False Negative Rate actually meant a real positive rate, depending on how your looked at it.

Or something like that...

Got you thinking now, right?

Come one, be creative in showing me how off the mark I am!
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