Well The Guardian is now reporting "boots on the ground" on Mount Sinjar, for humanitarian purposes, both US & UK SOF:http://www.theguardian.com/world/201...e-yazidis-iraq

I knew Sinjar refered to seized AQ Iraq records, not this - which explains some of the recent aerial activity:
The US ran a military and intelligence base on a now disused airfield at the top of Mount Sinjar for much of the Iraq war and the terrain of the rugged 45 mile ridgeline is well known to special operations units.