As retired military ( E1 to CW3 ), I love the role of each of the three states of crew members. In SH4 looking at all of the "shavetails" with out some worker bees (enlisted) was unreal. The thought of all of those officers "WORKING" on KP, chipping paint, and other dirty work was unrealistic.
SH3 had it about right, except for the extreem endurance of some of the CPO's and Officers later in the game.
Remember "Jonsey" in Hunt for red October? Specialist among the enlisted and CPO ranks are needed for realistic input to the game. Remember it was an enlisted radarman who saw a "very large" flight of airplanes coming from the north on 7,Dec 1941 --- and a officer who said " don't worry".
The repair crew in SH3 was a good idea, and it took them from the crew.
In SH4 those bunch of guys were just hanging arround.
That's my two bits worth.
Thanks for your input SNAKE1937