This is the GWX version of the NDD_Fletcher. right? The hull camo is the embedded with the 1st material item. To change the camo, you need to exchange the chart or, if you aim at using external texture charts, you need change the settings of material 1 and 3 (look at other models for guidance).
Note, the charts of NDD_Somers and NDD_Fletcher are slightly different, as it is the UV mapping. So, using the Somers textures with the Fletcher may not work perfectly.
Good luck
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