it already exist! image - U.S.M.C.

"You could oversee a bombing mission overseas then break for dinner with the family," says Roy Smith, an engineer at Boeing, which is developing the X-45.

Unmanned machines like the X-45 are being cooked up and tested in the country's most advanced labs. Within 20 years, squadrons of unmanned planes will swarm enemy sites like killer bees, launching missiles and avoiding detection with sophisticated jamming devices.

Self-programmed submarines will replace dolphins to detect and disarm mines. Robotic mules the size of pickups will haul ammunition, medical supplies and food.

Drone ambulances will load wounded soldiers and cart them to hospitals. Crablike robots will crawl into buildings to sniff out chemical stashes.