Challenge Coin US Navy Firefighters. This is a challenge coin for the U. Naval Forces Japan (CNFJ) Fire Department. Or maybe it was there, but it’s been closed for a long time so it’s in very good condition. A specialty shop offering a wide variety of carefully selected Japanese brand items. Even if you think to yourself, But the item I want is only available in Japan. , make sure to consult with us before giving up hope. We will look for and suggest the best products on your behalf. International Buyers – Please Note.