It dates back to the times of the Romans. Each unit of soldiers had a flag that helped identify them in battle and in larger units. A person that commanded a group of soldiers was named after the ensign or flag that they assembled under.
The name of the movie was Ensign Pulver.
ensign
(flag) The ship's ensign showed that it was from foreign waters. (officer - the rank of ensign is the lowest line officer rank in the US Navy) The ensign was in charge of painting the galley.
Ensign.
The word ensign is a noun and a verb. The noun form is a badge of office or rank. The verb form means to distinguish by a mark.
A small flag or a junior officer rank.
Harry Ensign's birth name is Harris Newton Ensign.
Ordinary Seaman (Enlisted), Ensign (Officer)
0-1, Ensign
If he was in an army or militia it would be considered a 2nd Lieutenant.
He entered the navy as an ensign and finished the war as lieutenant commander.
I'm pretty sure it is ENS for ensign (the lowest Navy rank).