Plywood.

This is coolbert:

Nothing like this since the time of the Second World War. A modern wooden warplane. A glider more correctly.

Thanks to Popular Mechanics, the tip from Freeper and the article by Kyle Mizokami 

"The Marines’ Plywood Supply Drone Is Undergoing Flight Tests"

"The low-cost drone can deliver supplies to ground forces with pinpoint accuracy."

"LG-1K, developed by Logistic Gliders Inc under contract with DARPA and the U.S. Marine Corps Warfighting Laboratory, is meant to be a very low-cost drone capable of being released from fixed-wing aircraft or helicopter. The plywood and aluminum drone is 10.4 feet long with a 23=foot wingspan. The LG-1K can carry up to 700 lb.s of supplies."

You can get some sense of scale of the drone glider from the You Tube video. LG-1K disposable. Can be controlled from the ground or autonomously lands via GPS system.

Think from the era of WW2 the Horsa glider and the Mosquito two-engine multi-purpose warplane. Made predominantly of wood and quite successful in both cases.

Devoted readers to the blog will know of other modern instances of modern wooden warplanes. Off the top of my head I can think of none.

coolbert.