The way I read the table is that the "active missile defence" includes investments from everything from VSHORAD up. So $7-10 billion for everything.
I also noted the wording for NASAMS says ".. the first two batteries now in service...". Given that that I thought we only purchased two batteries, this indicates more might be procured. Perhaps I'm reading to much between the lines.
The wording was also very specific for a "medium range" ground based air defence system. The wording is a bit obtuse. I assume it excludes high end ballistic missile defence, so its not arrow or thaad. But it could be AMRAAM-ER or patriot or both.
Given the problems with patriot availability (and excessive reliance on the Americans), I'm wondering if something like the Japanese new type 03 kai series, which supposedly has a terminal phase ballistic and hypersonic capability might be considered. The Koreans have some interesting air defence missile systems as well.
I can imagine the government would want to commonalise fire control systems and radars, so I wonder if Japan and Korea would let their missiles be integrated with our Kongsberg panel and CEA radars. Could be interesting.
So, if I put some pieces together, a program could be something like
- Mistral 3 mounted and dismounted systems. Romania bought 300 missile packages for about $1 billion. Sets up Nioa.
- An additional 2 NASAMS batteries. Another $2 billion. Keeps the South Australian factory open.
- Upgrade NASAMS to AMRAAM ER (border line medium range system in its own right)
- The rest on patriot, or a Japanese or Korean proper medium range system. $5-7 billion buys somewhere between 2-4 batteries.