The United States military gets their hands on some very cutting edge innovations and the Block Access to Deny Entry (BlockADE) has just jumped straight to the head of the line. Although still a concept, it is purported to be a nearly impenetrable wall that can be carried around in a canister. Blown up with needed as an impromptu shield, it can help protect soldiers on the ground more effectively than bulletproof vests and handheld shields.
Devised by Defense Advanced Research Projects Agency (DARPA), the Block Access to Deny Entry was the answer to a challenge to "construct a barrier without human intervention." DARPA states, "These deployable systems are expected to have many potential applications ranging from blocking access to munitions caches to creating temporary buildings for those impacted by natural disasters."