Just to be clear on this, the Mastiff is a
Force Protection Cougar variant. These vehicles were bought as COTS items and that name was not given to them by the USMC. That's the name they have always been marketed under by Force Protection (there's some issue with the Typhoon nomenclature, but if this did exist, it didn't last very long). Mastiff, and now Mastiff 2 are names applied to subvariants of the pattern tailored to British needs, just as the USMC and US Army have a number of Cougar subvariants in service. The British were also investigating a 4x4 subvariant, referred to as the Ridgeback, and Force Protection's new Tactical Support Vehicle Cougar variant as the Wolfhound.
More info:
http://www.army.mod.uk/equipment/fig...cles/1483.aspx
http://www.globalsecurity.org/milita...d/mrap-var.htm