The call up terms for the 4624 sqn (oggie movers) is 12 months in 3 yrs that is if a oggie done 12 months that person could not be called up for 2 yrs although they thought it was better to call them up for 6 months at a time which meant some people for 6 months then 12 months latter called up again.
This has been going on since 1999 when we were first called up for Kosavo.But since then there was a compulsory call up for Afghan 2002 then a full sqn call up for GW2.There have been continuous call ups since.
after the SMR came up with the figure of 1200 movers that was when the oggies strength was 300 but i think you will find it to be a lot less now then you have the ones that cannot be called upon.