Star_Sage: Found two of these myself, but giving up on finding the other two the manual says are there. If you're curious, I found one positive, and one negative.

Crewmen and Officers at about 1:1 and at least(Though can be more) 4:1 total compared to what others combined are
'Sharp Minds'

Damage +10%
Hit +10%
Travel Speed +25%

More Marines than Others Combined at about 2:5
'Marines Can't Fly

Damage -10%
Hit -10%
Travel Speed -10%

Anyone else found the other two?

Star_Sage: Found two of these myself, but giving up on finding the other two the manual says are there. If you're curious, I found one positive, and one negative.

Crewmen and Officers at about 1:1 and at least(Though can be more) 4:1 total compared to what others combined are
'Sharp Minds'

Damage +10%
Hit +10%
Travel Speed +25%

More Marines than Others Combined at about 2:5
'Marines Can't Fly

Damage -10%
Hit -10%
Travel Speed -10%

Anyone else found the other two?

MtMad: Crewmen & Officers
Ratio Around 6:1
Damage +5%
Hit +5%
Travel Speed +10%
Worked on Patton (With Boarding Shuttle cargobay ) with 36 crew and 8-6 Officers
and 0-2 marines

Pirates Ho!
Ratio Arround 8:1
Damage +10%
Hit +10%
Travel Speed +10%
Worked on Patton (With Boarding Shuttle cargobay ) with 36 crew and 4 Officers
Apparently no marines allowed at all

I did not conduct further testing