Corporal Brandon S. Mettlen, right, 25, a Chemical, Biological, Radiological and Nuclear defense specialist and native of Colnosneil, Texas, native, prepares to descend into a disaster area during a technical rescue certification exercise, Feb. 5, 2011. Chemical, Biological, Radiological, and Nuclear defense Marines with the 22nd Marine Expeditionary Unit participated in specialized classes on technical rescue during a two-week training evolution aboard the Center for National Response, in Gallagher, W.V. The Marines and sailors of the 22nd MEU are in the early stages of their pre-deployment training program, which is a series of progressively complex exercises designed to train and test the MEU's ability to operate as a cohesive and effective fighting force. - Corporal Brandon S. Mettlen, right, 25, a Chemical, Biological, Radiological and Nuclear defense specialist and native of Colnosneil, Texas, native, prepares to descend into a disaster area during a technical rescue certification exercise, Feb. 5, 2011. Chemical, Biological, Radiological, and Nuclear defense Marines with the 22nd Marine Expeditionary Unit participated in specialized classes on technical rescue during a two-week training evolution aboard the Center for National Response, in Gallagher, W.V. The Marines and sailors of the 22nd MEU are in the early stages of their pre-deployment training program, which is a series of progressively complex exercises designed to train and test the MEU's ability to operate as a cohesive and effective fighting force.