They'd only have helmets while at "battle stations" (for real or for drill).
The rest of the time, they'd be in "dixie cups" and the Chiefs would have visored caps (more typically with the khaki cover on with dungarees, unlike the box art). The officers would be in khaki (probably) and with either visored covers, or, more typically, aviator ball caps (which have a very long bill in WWII).
Officers might have drawn a set of Utilities, but wearing them would be another matter.
1/48 probably as complicated as 1/24 for finding figures (not that 1/32 is a huge oasis).