Just asked the missus, she say a mule is an equid and therefore that counts.
I believe it was in the seventies that a survey revealed several million mule shoes in heated storage at an R.A.OC depot even though the last mules had left the army donkeys years before.
I seem to recall a piece in (IIRC) the BAR not all that long ago from a staff officer who had (amongst other things) the duty for maintaining doctrine about use of mules. Quite interesting!
The last mule troop didn’t leave U.K. service until 1975 apparently (I was searching for confirmation of the BAR story).
ETA: Par_Avion best me to the HK bit.
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