Army Sgt. Michael Cavallo, a research assistant at the U.S. Army Research Institute of Environmental Medicine in Natick, Mass., walks on a patented, force-sensing treadmill invented at the lab. Dr. Joseph Seay monitors Cavallo’s efforts. Systems are attached to measure oxygen consumption to determine locomotion efficiency. DoD photo by Fred W. Baker III Army Sgt. Michael Cavallo, a research assistant at the U.S. Army Research Institute of Environmental Medicine in Natick, Mass., walks on a patented, force-sensing treadmill invented at the lab. Dr. Joseph Seay monitors Cavallo’s efforts. Systems are attached to measure oxygen consumption to determine locomotion efficiency. DoD photo by Fred W. Baker III SHARE: Download: Full Size (1.09 MB) Credit: VIRIN: 989493-G-EBE14-301.jpg Photo Gallery