What the heck really
You're right, i checked for myself and i can confirm this too. No matter what face you choose your character to have when using the CSAT wetsuit you will always end up with this face. Other wetsuits allow custom character faces.
This is still an issue in 1.40 stable. Again, it only affects the CSAT wetsuit.
Also all of the models seem to have a misaligned vertex for the left arm. Whenever the unit uses an animation that flexes the left arm, the vertex clips all the way into the model's chest or stretches into the head when idle.
After tinkering around with the config, this issue is caused because the base class for OPFOR divers (O_Soldier_diver_base_F) does not have the selectionPersonality parameter defined.
A very simple custom config addon that adds selectionPersonality = "personality"; to the base class automatically fixes this issue:
On a side note, the vertex bug with the model itself still has not been fixed.