We don't often link to an article in Popular Mechanics, but Instapundit does, and this one is fun stuff. It turns out Logistics Gliders Inc. under contract by DARPA has developed an unmanned plywood single use glider for Marines to use for field resupply.
The wooden glider is dropped from a cargo plane and can carry up to 700 pounds of supplies to a GPS-designated spot. This is a clever mix of high and low tech. It is a great way to deliver food, water, fuel and munitions to ground units in remote areas.
The article doesn't say so but it could also stealthily deliver 4-500 lbs. of explosive upon an unsuspecting enemy. That much propane as a fuel/air explosive delivers a world of hurt.