Good idea, but unless implemented in some sort of military framework, I daresay completely flawed.
(Now for my attempt at humour, sic)
It's actually an Aussie b*stardisation of a kiwi term for "yes mate" - which they would say as "aye cuz"... ICUS....
I know, flame on.
And before anyone from NZ says anything, I have lived there, and did come back saying bro, cuz, mean, and I have a whopping huge Maori inspired tattoo.