It was my understanding that this vehicle IS used by the USMC. Then again, maybe they were the ones put out by Force Protection.
Just did a Google search, and yes the USMC is using a vehicle called the RG-31 Cougar, which looks just like this vehicle.
I definitely remember reading somewhere that the US military has decided to drop the humvee as its main light troop carrier, presumably because of inadequate blast protection. I haven't heard what the replacement will be, but I'm sure it will be much more blast proof. The US military may decide to go with a number of different blast proof vehicles for different kinds of missions. If it was up to me, that's what I would do.
A US Marine Corps RG-31 Cougar rests on its front axel after an improvised explosive device detonated under the vehicle near Camp Taqaddum, Iraq, Jan. 6. The IED detonated directly under the vehicle; however, the blast was pushed outward instead of directly straight up due to the vehicle's “V” –shaped undercarriage. Of the five service members in the vehicle, two received concussions and two others received minor burns. (Photo by: Courtesy photo by 8th Engineer Support Battalion)