'Grunt' tackles the science behind some of a soldier's most challenging adversaries -- panic, exhaustion, heat, noise -- and introduces us to the scientists who seek to conquer them. Mary Roach dodges hostile fire with the U.S. Marine Corps Paintball Team as part of a study on hearing loss and survivability in combat. She visits the fashion design studio of U.S. Army Natick Labs and learns why a zipper is a problem for a sniper. She visits a repurposed...

Technological advances on the battlefield have led to a decrease in the number of casualties and led to better communication systems. This film looks at how surveillance drones, remotely powered vehicles, and improvements in training and equipment that help soldiers survive poison gas attacks. See how modern technology is changing the way we fight wars.

"A riveting inside look at an elite unit within the Pentagon--the Defense Innovation Unit, also known as Unit X--whose mission is to bring Silicon Valley's cutting-edge technology to America's military, from the two men who launched the unit." --