Although the term 'armlet' may be technically similar, it is taken to mean an item that sits on the upper arm. The origin of the term 'bracelet' is from the Latin 'brachile' meaning 'of the arm', via the Old French 'barcel'.
Taken in the plural, "bracelets" is often use as slang for handcuffs.
On each bracelet is engraved, at a minimum, the name, rank, service, loss date, and country of loss of a missing man from the Vietnam War.
The first bracelets were made by a young lady named Carol Bates, who now works for the Defense POW-Missing Persons Office (that is, she, Carol, was younger then than now, as we all were).
I was the National Chairman of the POW/MIA Bracelet Campaign for VIVA (Voices In Vital America), the Los Angeles based student organization that produced and distributed the bracelets during the Vietnam War.