without looking at the front of the vehicle, i really not sure of the brand.
found something to support your theory of being a Tacoma from wikipeida.
During Operation Iraqi Freedom, and Operation Enduring Freedom, multiple Toyota Tacomas have been observed in use by special forces units of the U.S. Army. Typically, they have been Double Cab models, with SR5 and TRD packages.
Despite the fact that the Hilux, which the Tacoma is based on, is extremely common in the Middle East, SF found it to be easier to purchase them from American dealerships, modify them appropriately, and ship them to their areas. The Tacoma and Hilux share a similar body, but the chassis is significantly different in the Tacoma and believed to be much weaker[citation needed]. The gasoline engine used is significantly quieter than the diesel engines used in the HMMWV. These were modified by eliminating the factory radio, along with almost all exterior lights and door buzzers. The front headlights have been modified to work in IR, in order to work with night vision. The engines are unmodified, but the vehicles have been fitted with brush guards, Warn winches, and a rollbar with a machine gun mount
look like US Army learned from somali mistake to copied the rebels who weld a 12.7mm mount onto Hilux or Landcrusier on the flatbed and turn the pick up into a heavy MG platform. But they should have stick to the Hilux which IMHO is the better vehicle. And why the american like gasoline so much? gasoline burn more easy than diesel.