Itīs a mix from scripted ships and random ships. You could open the two files in the folder:
GWX\data\Campaigns\Campaign the files you could open are campaign_RND.mis (random events) and campaign_SCR.mis (scripted events).
Ships and groups in the first file have a value behind the line "SpawnProbability" giving you the probability in percent. Ships and groups from SCR.mis will be spawn always by starting a patrol.
You can open those files with the missin editor from SH3 or with any text editor.
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