Army Sgt. 1st Class Jonathan Cook, left, wraps shock tube around a guide stake and instructs Army Pvt. Marc Doohan during the 116th Cavalry Brigade Combat Team’s eXportable Combat Training Capability rotation at the Orchard Combat Training Center, Boise, Idaho June 15, 2018. Cook is an operations sergeant assigned to the Idaho Army National Guard's Company A, 116th Engineer Battalion. Doohan is assigned to the Army Reserve’s 321st Engineer Battalion. Army photo by Spc. Jonnie Riley