If it's SDSR and A2020 (and therefore I assume AR2020?) it might be worth taking a look into how the US and Canada, amongst others, changed from a predominantly professional Military to a much higher proportion of reservists. I understand that one of the key tenets of A2020 was to bring the UK more in line with other First World militaries with the regular:reservist ratio.

In terms of 'military change models' my experience is much as David has suggested. That being the military in question either utilises a change model that 'fits' best with the national culture and/or organisational culture; or, and this is a post-modern trend, buy the change expertise in in the form of a consultant. The benefit of the latter is that the contractor comes in without the preconceptions, traditional and regimental bonds that exist if the change is managed from within...

Just some thoughts. Happy to discuss further but hopeful of others jumping in.