Javelin Thrust 2012/Large Scale Exercise-1 is underway at the Marine Corps Air Ground Combat Center in Twentynine Palms, Calif. More than 5,000 Marines from the 1st Marine Expeditionary Brigade, part of I Marine Expeditionary Force and Marine Forces Reserve are participating in the exercise. The large-scale exercise is the first in a three-part continuum, culminating with a Navy and Marine Corps led amphibious exercise Dawn Blitz in 2013. Javelin Thrust is the largest annual Marine Corps Reserve and active duty training exercise, comprised of reserve Marines from 38 states, 2nd Tank Battalion, 2nd Marine Division, 9th Communication Battalion, and the newly activated 1st Law Enforcement Battalion, I Marine Expeditionary Force. The 33 Canadian Brigade Group from Ottawa, Canada is participating as a coalition force, with a higher headquarters based at Camp Pendleton.