At Bagram Air Force Base in Afghanistan, Staff Sgt. Michael Johnson exercises under a long, steel framework set on a wooden platform. It looks like a giant jungle gym. Above his head are pull-up bars and rings. A climbing rope is off to one side.
It's here where he and dozens of other soldiers and sailors will remember the fallen, just after sunrise, on Memorial Day. They'll all take part in a grueling exercise regimen, part of CrossFit, the popular high-intensity workout program.