Though not in news too much, it's been said maybe 6,000 ISIS troops (out of 7,000-12,000 total troops) have been killed. Now with Japan getting involved, it may not be a situation where a country plays as passive with their citizens getting murdered. http://www.cnn.com/2015/01/22/politics/us-officials-say-6000-isis-fighters-killed-in-battles/ http://www.bbc.com/news/world-middle-east-30966651 Also though not talked about, Japan has had a pretty considerable military since the 1970s, downplayed as a "defence force", but have certainly been trained in offensive capability, much of it by good ole USA. I wonder if Japan will consider adding troops as well as money. In the past when Japan says something is unforgivable and will act, they don't hold back. It doesn't matter if it's Yakuza or whatever so I think they will pledge some troops this time. The US can't expect to singlehandedly take out ISIS or let just Arabs die doing the policing over in Syria.