The images for the officers 'on the boat' can be set via the index value in the crew_config file.
The index for the ofaces folder is as follows:
Index1 = Off12
Index2 = Off13
Index3 = Off14
Index4 = Off21
Index5 = Off22
Index6 = Off23
Index7 = Off24
Index8 = Off31
Index9 = Off32
Index10 = Off33
Index11 = Off34
Index12 = Off11
*******
The actual crew data looks like this:
[CREW_MEMBER_0]
Name=Peter Donitz
Index=2 <-----------Change this value to assign different image
NrComp=0
Type=2
Grad=6
Renown=1001.000000
Patrols=0
Morale=0.800000
Fatigue=0.000000
HealthStatus=0
HitPoints=15.000000
Experience=300
Rank=11
NrQual=2
Qualification0=4
Qualification1=0
SpecialAbility=-1
MedalsInx0=-1
MedalsCant0=-1
MedalsInx1=-1
MedalsCant1=-1
MedalsInx2=-1
MedalsCant2=-1
MedalsInx3=-1
MedalsInx4=-1
MedalsInx5=-1
MedalsInx6=-1
MedalsInx7=-1
MedalsInx8=-1
HeadIdx=1
HeadTgaIdx=0
BodyIdx=0
BodyTgaIdx=0
HasHelmet=Yes
HelmetIdx=0
HelmetTgaIdx=0
VoiceIdx=1
*******
If you're starting a new patrol, the crew_config files are found in the SH3\data\Cfg folder. There are three files for each boat type, each corresponding to an early, mid or late war start. (i.e. if you start in 1939 or 1940 only file one is accessed).
Once the patrol is underway, the files in \MyDocuments\SH3\data\cfg\Careers are the only ones read.
If I understood the question correctly, this should help...
Hope it tosses the twins overboard!