Other ranks (or ORs) in the Royal Danish Army, Royal Danish Navy and Royal Danish Air Force is a joined term for military personnel that are not officers of various forces, by the NATO system of ranks and insignia. These personnel are NCOs and privates, seamen or aircraftsmen.
Can we infer the following?
Seamen is a rank in the Royal Danish Navy.

Pick from: -- Yes. -- It's impossible to say. -- No.
The answer is:
Yes