Talking Lasers

The DoD Joint Non-Lethal Weapons program has successfully created a unidirectional sound transmitter using lasers. In English, they use two lasers interacting at a point in space to reproduce specific sounds at that location.

Why is this important? Well, there are two reasons. First, it doesn't require a receiver. That means a voice transmission could be sent to a specific point in space -- say, the position of a reconnaissance or special forces team behind enemy lines -- with updated orders. Secondly, it's line of sight. The combination of those two factors means it's the closest thing to a non-interceptable messaging system ever created. Headquarters could direct a team to a new position with virtually no danger of the message being intercepted by the enemy and used to locate the team, (the enemy would literally have to be close enough to hear it, in which case they'd already be engaging).

I'm sure there are many other uses, such as psyops. But the most important reason to do it: because We can and They can't. That's an automatic advantage, and you always exploit battlefield advantages, no matter how small. Because a lot of small advantages can add up to a big one.