Spc. Brandon Dubois (right), a team leader with the 617th Engineer Company, 864th Eng. Battalion, and Pvt. Greg Bolden maintain defense fighting positions after sighting an approaching enemy during a battalion-wide field training exercise on Joint Base Lewis-McChord, Wash., Feb. 3-13, 2012. Dubois, Bolden and the rest of the battalion found themselves pulling more security and training more on infantry-style tactics than ever before -- a change in pace to meet the requirements on new Army doctrine.