Wessex, you might find that the 'chartering' of the A-4s by the Navy/Dept of Defence was chepaer than utilising Hornets or Pigs to do little more than be a 500kt Radar Dot for the most part. Yes, the RAAF did the 'usual' amount of Fleet Suppt, to ensure both parties received the mutually beneficial training etc. RAAF airframe hours have a limit in terms of total utilisation and a yearly 'flog rate', and you wouldn't want your Jet crews doing ONLY fleet support for their 250 or so hours each year. Likewise the Learjets couldn't travel fast enough to represent ASM all of the time, so it was 'prudent' to use some other 'rent-a-threat'. Well done RNZAF.