3 seconds saved on a 200 meters run. 18 seconds saved on a 1600 meters run.

Right. It's a bit disappointing in the context of a page with the lead-in "What if every soldier could run a four-minute mile?" but I trust this research is still a work in progress and adding an 11lb weight + helmet and taking those times off is a significant achievement.

It also sounded like the 11lb was the weight of the prototype. so when they achieved the four-minute-mile they probably shrink it.