Treloar and Billing 2011 wanted to determine if load effects sprint time and by how much. They had 17 US Army infantry soldiers run 5 30m sprints unweighted and weighted. Unweighted was in a t-shirt and shorts, weighted was weapon, helmet, body armour and combat kit- totalling to 22kg (48.4lb). It was found that with load, the average run was 2 seconds slower- with 52% of the decreased speed coming in the first 5m. This would indicate that the initial acceleration is affected the most during weighted sprints. It can be extrapolated that if adding 22kg load to soldiers affects a 30m sprint, then having them haul all their equipment over kilometres will clearly slow them down. While most of this equipment is obviously necessary- load vs. mobility is an issue various militaries should readdress.