Quote:
Originally Posted by ET2SN
The formal ranks for a Petty Officer third class and Petty Officer second class (in the US Navy).
I could write more about this if you're interested, but it would be a long slog. 
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No Your answer was enough to explain what E4 and E5 mean.
I guess E4 is Petty Officer third class
and E5 is is Petty Officer second class
Could also be the other way around.
If so then E3 must be Petty officer first class
Markus