Yes - with each save or campaign adv, all ships marked "Unique" are checked by the campaign and if dead, they are dead:-
This is the roster cfg where unique ships are stated
[UnitClass]
ClassName=BBRoyalSovereign
UnitType=11
AppearanceDate=19160316
DisappearanceDate=19480301
DisplayName=BR BB Royal Sovereign (proxy)
IsUnique=yes
[Texture 1]
TextureName=
LightmapTextureName=data/Sea/NBB_QueenElizabeth/NBB_QE_O01.tga
NormalmapTextureName=
StartDate=19390101
EndDate=19461231
Frequency=1
[Unit 1]
Name=HMS Revenge
DOC=19160316
DOD=19480901
[Unit 2]
Name=
HMS Royal Oak
DOC=19160616
DOD=19391014
[Unit 3]
Name=HMS Royal Sovereign
DOC=19160616
DOD=19490401
[Unit 4]
Name=HMS Resolution
DOC=19161216
DOD=19480501
[Unit 5]
Name=HMS Ramillies
DOC=19170916
DOD=19480301
;************* THE END ***************
And here is the campaign profile for that ship:-
[CampaignProgress.MisResult 15.MisKill 6]
Name=
HMS Royal Oak
ClassName=BBRoyalSovereign
Type=11
Side=1
KillDate=19390930
Tonnage=31000
Long=-356980.218750
Lat=7070345.000000
Height=-12.800246
IsFromSingleMis=false
[CampaignProgress.UniqueShipsStatus 16]
Name=
HMS Royal Oak
ClassName=BBRoyalSovereign
Active=false
Dead=true
As you can see - I sank this ship 30/09/39 and the campaign knows it and will not use it again
