Maj. Brad Warr, U.S. Army Research Institute of Environmental Medicine researching physician assistant, uses a digital gauge to measure how much weight a Soldier lifts when recovering the spade trail arm and blade on an M777 howitzer May 5, at the 1st Lt. Fredrick Henry Individual Tactics andTechniques Training Complex here. Soldiers assigned to 1st Battalion, 17th Field Artillery participated in an ongoing evaluation of the physical demands that are placed on a Soldier in the cannon crewmember 13B military occupational specialty.