Interesting.
Do both Army and RAAF have separate stocks of Aim 120 or do they draw from the one source?
If they do have separate stock, are they interchangeable or are the land based version different?
Army ordered the AIM-120C7 as the initial weapon to arm the NASAMS air defence system. Perhaps this is being updated with the C8 version, or perhaps this entire order is for RAAF employed weapons?
The US Department of State and Defense Security Cooperation Agency (DSCA) have formally signed-off on a US$240.5 million Foreign Military Sale (FMS) to support Australia's introduction of the Nationa
www.defenceconnect.com.au
ADF refuses to even comment on how these weapons are used publicly, but I tend towards the idea that these C8 variants are intended for NASAMS, the reasoning being that the C8 is a -C model AMRAAM with elements of the F3R AMRAAM upgrade hosted on the -C missile body whereas the AIM-120D3 is the same F3R upgrade hosted on the -D model missile body. RAAF has previously also ordered the earlier AIM-120D models which in CATM variation have been observed flying on RAAF aircraft.
australianaviation.com.au
At present the -D model has not yet been integrated onto eNASAMS, at least as far as I am aware on the public records about the topic I have read.
Of course there could be a capability reason or cost reason or some integration / flight test reason perhaps as to why RAAF would order both the C8 and the D3, noting of course that other countries (such as Japan) have also done so and they don't operate the AMRAAM in a ground launched SAM role:
So clearly there must be some benefit in operating both variants in an air to air role, that are not revealed publicly...