"You would wear it on your right arm."

Is not correct. A black armband should be worn on your left arm. The reason for this is that the armband represents the deceased and by wearing the armband you are wanting to keep the deceased close to your heart. Your left arm is the one closer to your heart.

no. This is untrue.

An MP3 armband allows the player to be fitted to an armband and worn around the wrist or lower arm whilst jogging, or other activities. The armband allows free access to all the necessary keys or buttons.

It's actually a sleeve and it keeps his shooting arm warm.

It is a captain armband you should see a c on it (captain).