Harry Potter's invisibility cloak?

Link:http://www.dailymail.co.uk/sciencetech/article-3500893/Military-tests-Hogwarts-style-device-shields-troops-projecting-surroundings-surface.html

This article talks about military tests that are developing a cloak that would be used as a visual camouflage. 

This cloak is being developed by the british soldiers. This cloak would allow the soldiers disappear in the middle of the battlefield.

This cloak is inspired in how cephalopods, such as squid or octopus. Both animals use a special type of cells that allow them to disappear in the enviroment.

Opinion:
This cloak would be a huge advantage for all the troops, because for they would be easier to accomplish infiltration missions because they pass unseen in front of the guards.