In my opinion this is a prudent use of force.
Could be for sure.
In the past it seems when Marines are sent to the Embassy,
it's soon to be evacuated which means SHTF.
I wonder if they know something we don't?
or if like you said, this is a show of force.
Either way I'll be watching this very closely.
The Iraqi government and the Shia militias are about to run into this problem. Just 50 miles to the west of Baghdad is the city of Fallujah, where a coalition of Sunni tribes and ISIS militants have held sway since January. There appears to be sporadic fighting in villages near the city, but no offensive has emerged there on the scale which seized Mosul in the north.
*It may be that Sunni militant forces in Anbar were so badly beaten up in the fighting with the ISF around Fallujah and Ramadi that they are not capable of mounting such an attack. Alternatively, they may be preparing to do precisely that.*