Botak
Active member
I know for a fact in the Australian Army it's definitely possible to be busted down multiple ranks. A colleague of mine (actually he was a bit of a mentor figure) is a bit old school and is thus regarded as something of a loose cannon by some more regimental types... he avoided being busted from Corporal to Trooper (i.e. Private) on a legal technicality, but at the time I reckon he deserved everything he got. 
I've also seen a medic promoted from Private to Corporal in the one bound (although she had all her courses completed, including promotion courses).
Of course it's also possible to be reduced in rank for administrative reasons. If you transfer Corps (Say go from being a Corporal in the Infantry to being a Trooper in Armoured), or if you transfer from Reserves to Regulars, there's usually a rank reduction involved (not counting all-corps postings etc). Needless to say if you go SF and you're an NCO you're usually looking at saying goodbye to your rank in that instance there as well, although that's a very different ballgame and one I'm not willing (or qualified) to talk too much about.

I've also seen a medic promoted from Private to Corporal in the one bound (although she had all her courses completed, including promotion courses).
Of course it's also possible to be reduced in rank for administrative reasons. If you transfer Corps (Say go from being a Corporal in the Infantry to being a Trooper in Armoured), or if you transfer from Reserves to Regulars, there's usually a rank reduction involved (not counting all-corps postings etc). Needless to say if you go SF and you're an NCO you're usually looking at saying goodbye to your rank in that instance there as well, although that's a very different ballgame and one I'm not willing (or qualified) to talk too much about.