Cherry, the Australian Army will (when all the Phase 2 ASLAV's are upgraded and rolled out) operate 257 "Phase 3" ASLAV's. These ASLAV's are primarily operated by the 2nd Cavalry Regiment (1 Squadron out of 3 is still equipped with phase 2 ASLAV's) and the 2/14 Light Horse (Recon) Regiment (2 Squadrons out of 3) are yet to be equipped with ASLAV.
The remaining squadrons within 2 Cav and 2/14LH will be equipped fully with ASLAV's by the end of 2005. The School of Armour also operates a significant number of ASLAV's. I'm not sure of the breakdown of the individual numbers of each variant, however the ASLAV-25 is the predominant vehicle within the ASLAV fleet.
I agree that the 12.7mm guns should not be the sole weapon on the upgraded M113. They should at least be integrated with 40mm Automatic Grenade Launchers, just as the ASLAV PC's will be shortly...
A better (and realistic) option in my book would be to relegate the 12.7mm QCB Machine Guns to "support" vehicles (command vehicles, fitters tracks etc) and equip the M113AS3/4 with the turret from the ASLAV and the same 25mm M242 Bushmaster gun as the ASLAV. The 12.7mm gun won't provide sufficient firepower in coming years, particularly when the vehicle may have to be used against other IFV's, IMHO.
For others info reading this, Australia's current M113's are fitted with a Vietnam era T-50 turret mounting an 12.7mm QCB heavy machine gun and a 7.62mm machine fire over open sights.
The new upgrade program is replacing the current turret with a new (Electrically driven) one fitted with the "new" 12.7mm QCB (which is already IN the M113's in most units) and a day/night passive sighting system and a computerised fire control system. The only advantage in this upgrade is the engagement speed and accuracy of the weapon system fitted. It will NOT provide a firepower increase, despite this being a stated goal of the upgrade.
How can removing a weapon system INCREASE the systems firepower? The same way removing the F-111 from the RAAF's order of battle will increase our Strike power I suppose...
As to the HIMARS question. It'd be nice and I can guarantee the Army (and the Royal Regiment of Australian Artillery in particular) would LOVE the HIMARS system. Unfortunately I saw a briefing on Australia's future firepower options a couple of years back. HIMARS was included on the list (as were new 81mm mortars, 120mm self-propelled mortars, new self-propelled guns and new direct fire weapons) but crossed through it were 2 diagonal lines and the word "NO" written across it in large yellow letters.
The adjutant of my Unit who gave the briefing was asked about that, and it was stated that there was practically no chance of the Australian Army EVER acquiring HIMARS or MLRS...