In real militaries it is usually officers who pilot the ships (or fly the planes).This
doesn't help in the least.
Still, I'll reply back anywho.
Also, in the Navy (or atleast the New Zealand, Australian, and American ones..) the Captain/Commander/Whoever-is-on-duty-at-that-time gives the order to go somewhere, to the Officer of the Watch (Some Lieutenant Usually), who gives the order to the Helmsman who is an Enlisted sailor.
The order-conga is a safeguard so somebody doesn't mis-hear an order and whoopsie daisy.
Sure, in the Airforce the Officers pilot the planes, but that's because it's Airforce tradition (even though there used to be Pilot-Sergeants....), whereas in the Navy the tradition is officers are not supposed
to pilot the ship (I'm sure they could if need be but just as a General is not supposed
to galavant around playing Lieutenant...if they can still do it, good on them; but it tends to raise eyebrows at the very least (probably makes people antsy too).
Unrestricted Line Officers (the 'Yellow Shirts' to use the TOS parlance) are the ones who stand watch and give orders, being groomed eventually for Captaincy of their own (or at least Division Chief or maybe even Executive Officer if they make it even that far).
And, I don't know why that is. Probably so Officers can learn to Command properly rather than leading (which requires a different mentality altogether), but I'm sure someone with Navy experience can explain the whys and wherefores altogether