Another artillery option could be to follow the Americans. They are currently investigating (
link) the feasibility of fitting Patria's NEMO 120mm remotely-operated turreted mortar to their Stryker fleet (which are very similar to NZ Army LAVs). Seeing as NZ has perhaps 30 LAV3 vehicles in excess of its current requirement (
link) and supposedly up for sale (but seemingly unlikely to find a buyer), would re-fitting some as self-propelled mortars be a clever idea? The armour on the LAV (14.5mm-proof on the front, 7.62mm on the sides) would seem adequate for such a role (where shell fragments from counter-battery fire would be a major threat). The weakness of the LAV (no V-shaped hull) wouldn't be as big a problem in a mortar carrier as it is in a troop carrier (the mortar variant should be further back behind the front line)
I figure you would perhaps want 1 (or maybe 2) other LAVs converted to serve as ammo carriers for every mortar-equipped variant. Preferably those may be able to keep the 25mm turret (to save on conversion cost) and you could just repurpose the troop compartment for 120mm ammo carriage. Maybe you may need a fire-direction-centre vehicle as a battery leader as well. So, you could make a fair dent in those surplus vehicles fairly quickly by fielding a battery or two. NZ would gain a motorized fire support capability that could keep up with its motorized infantry, with commonality in vehicle logistics.
In a similar vein - as the Army's 81mm mortars are now an Artillery asset - would replacement of the 81mm with a towed 120mm then also be feasible. The 81mm is heavy enough to be not really man-portable (you are reliant on vehicles to provide enough ammunition in my view), so going to 120mm doesn't make things too much worse logistics-wise, but gives the opportunity to share a common calibre for your motorized and towed artillery. A 120mm these days could be a feasible replacement for a 105mm howitzer as well (especially for helicopter lift).
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Finally, the report on the Operation Burnham SAS incident in Afghanistan is now out (
link). Seems we weren't getting the whole truth after all from the top brass or the politicians (which seems to be a common trend these days). Not surprised at all. Accountability - what's that?