There's great benefit in using these unpowered exoskeletons even though the soldiers can carry supplies with their own muscles.
I've met some Canadian/American vets, one who fought in the Iraq war and some who haven't ever deployed. Many of them suffer from issues with their back and severe muscle pain. Years of carrying heavy packs takes its toll on even the strongest of men. This prevented some from continuing their high paying trades job and had to transition to lower paying desk jobs. These are not old guys, they start to see problems in their 20s and 30s
Exoskeletons distribute weight away from the spine and can serve to decrease long term medical costs and better integrate vets back into the civilian workforce and as more whole people.