• We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
How do you change unit class names
For Example US Improved Carrier to Wasp class

The file you're looking for is the models.csv file in the config sub-directory. It can be edit with any editor.

The US carriers are starting with this model (in AOD):
MODEL_USA_26_1;Lexington-class;....

You can freely add new models by filling the gaps between the existing models. But be aware that you've to keep the structure of these lines otherwise it won't work.