I made a comment in the t-shirt thread about challenge coins and some commented on my reference. You can just type into your browser 'military challenge coins' and tons of examples will pop up. There is also a Wikipedia description of history. Essentially, in the military, but also other organizations including police and fire departments, challenge coins are handed out to individual recipients by leadership, management, etc. For example, if a soldier demonstrates a high level of motivation, dedication to safety, acts of safety, or other behavior that should be noticed and rewarded, a coin is handed to them on the spot. Typically, just one or two coins are carried by a company commander, for example, at all times. If he/she recognized an act that needs positive reinforcement, a coin is taken from their pocket and given to the soldier. There is usually a brief exchange like, "Thank you very much soldier, we need more in the troop who look out for others." That's it. To many, coins are more valuable than individual medals because they are given on the spot. No forms requesting the recognition as is the case with medals. The last coin I received in the Army was at Arlington National Cemetary in the Iraq and Afghanistan sections. The aid to a brigadier general approached me and handed me a coin and said, "Thank you for your work helping veterans obtain service dogs." I said, "Thank you." He then walked away. [I was the first Iraq or Afghanistan veteran to receive a service dog for PTSD, and I became somewhat of a Guinea Pig on what not to do when dealing with those suffering with combat PTSD].
I thought challenge coins would be something the OB leadership (yourself, Corrie, and your designies) could give members who demonstrate and act of kindness, promotes safety, etc. I have received on coin since leaving the military and it came from the president of a yacht club. On the coin was an expression of thanks and all the flags that represented the yacht club. So, they are used by many groups to show thanks.
The emblems that you give members are of similar size to challenge coins, they could actually be the same on one side of the coin, the other could be and image and/or words that express gratitude from OB.
That's basically it. I'll be glad to answer any other questions if needed.
Cheers