Thanks for this Rentacow - glad that you're making missions!
If you're interested - here is the unclassified NATO Naval Gunfire Manual -
http://www.navedu.navy.mi.th/stg/dat.../ATP4E-Ch4.pdf
It includes procedures for calling in the different types of naval gunfire.
I use this
https://wideo.co/text-to-speech/ for making sound files for calling in the mission (and then use Audacity to make it work in DW.
I
tried to make a NGFS support training mission in Puerto Rico - as a prelude to a full 1983 Grenada mission - here:
https://www.subsim.com/radioroom/dow...o=file&id=5625 It's one of my first goes at mission making, so it's rough - and it was panned by the critics. But I tried to make it authentic.
I'll give the mission a try - I've read a little bit about the 'gunline' missions in Vietnam- in which Aussie destroyers took part
Let me know if this helps. Work's very busy, but I'd be happy to help research or look for things. I can test missions, but I'd be slow!
It's a shame that only aircraft can resupply...the Perry's not really a NGFS specialist, but it'd still be a cool mission to shoot all the rounds, then UNREP, then get back on the gunline!

We can only dream...
Cheers Rentacow,
Stew