Contains Potential Spoilers (And speculation for Chapter 29)
Is it possible that Admiralty Code is 'Sunk' on the moon? From the space suit she wears this might be the case. This would also explain why they other are having trouble finding her.
Also, it's possible that he name is either 'E' (For Enterprise), since she had the US flag on her suit, so it mightn't be too unlikely. It's also possible that she could be one of the Apollo craft.
Maybe for a crack she could be Victory, for the oldest naval vessel in service.