It's possible that safety and/or energy consumption is the issue. As noted by others, there are similar products like jumping stilts out there. While they are effective, it is very easy to get hurt on them. Falling from that height is very risky. One Amazon reviewer broke a wrist for example.
It also sounds like it takes a tremendous amount of energy to use these. One guy was hoping to replace his bicycle with these but discovered that despite being in tremendous shape he couldn't handle more than 15 minutes.
Having been in combat situations, the safety factor and energy depletion factor would be a serious problem for military use, especially while wearing body armor and/or carrying a pack.
It also sounds like it takes a tremendous amount of energy to use these. One guy was hoping to replace his bicycle with these but discovered that despite being in tremendous shape he couldn't handle more than 15 minutes.
Having been in combat situations, the safety factor and energy depletion factor would be a serious problem for military use, especially while wearing body armor and/or carrying a pack.