Hello everyone

Just came across this phrase in the 607 Squadron ORB from 1952-1954, with regards to exercises, and it had me scratching my head for a while wondering what on earth it meant. Fortunately there is a hand written addendum from February 12th 1969, with info from S/L Stephen, the Squadron's C.O. between 1953 and 1956:

RATS' ROLE - this was a Low Level exercise (done more than once by the Squadron). The name comes from the fact that the Squadron had to try and "sneak in on the ground floor" like rats in a house.

I'd never heard of the Northumbrian (or indeed County Durham) Vampire Rat before! Is this a phrase used by other units as well?