Medic Armband

See all armbands here:

https://www.roblox.com/catalog?Keyword=armband&Category=1&CreatorName=Iskender%27s%20Excellent%20Emporium&CreatorType=Group&salesTypeFilter=1

This style of armband is occasionally worn by medics so that they can be identified in warzones and other dangerous areas. Nowadays, from what I understand, patches are usually used instead -- but during the conflicts of the early 1900s, this was a standard part of the medic's kit.

More items here: https://www.roblox.com/catalog?Category=1&CreatorName=Iskender%27s%20Excellent%20Emporium&CreatorType=Group