In The Martian, why is it “Hermes Actual” ?

In The Martian, why is it “Hermes Actual” ?

I just saw the movie and Commander Lewis refers to the ship as "Hermes Actual" when transmitting to NASA. I don't know if it's common practice or something for the movie but why did she say "Hermes Actual" instead of just "Hermes"?

submitted by Intro24
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