Professor RODGER KRAM (Biomechanics, University of Colorado Boulder): Marine-types, soldier-types, EMTs, that's sort of thing.

NPR: Backpack Isolates Load for Better Carrying Ability

Rumer, known as "Kram, " now resides in Oregon and has retired after owning his own electronics company.

CNN: Five guys take same photo for 30 years

Rodger Kram studies biomechanics at the University of Colorado Boulder.

NPR: Backpack Isolates Load for Better Carrying Ability