Edit: Turns out the caption I’d found attached to this image was probably imperialist bullshit, so I updated it.
From @CommunistFFWhen :
iirc, those symbols were used by US soldiers who wanted to signal their intention to surrender/lay down arm or sth and NV soldiers knew not to shoot them Source
Original title of post: A North Vietnamese Army officer laughs at the peace symbol necklace of a captured American soldier, 1973
That's pretty cool. Critical support for draftees who immediately surrendered to the Vietnamese when they met them.