How to say "Sally was in the Navy"

Question

"Sally was in the Navy"= "Sally era en el marino"?

Thanks!

Answer 1

Sally era una marinero.

Sally was a sailor.

I think marinera (adjective) means "marine" as in a marine animal and that the noun (marinero) is invariant. Who knows? They weren't female sailors when the RAE tossed a coin to make marinero masculine.

Answer 2

Sally was in the Navy - Sally estuvo en La Marina