Alexander Balan was on a California beach when the idea for a new kind of drone came to him. This eureka moment led Balan to found Xdown, the company that's building the P.S. Killer (PSK)"an autonomous kamikaze drone that works like a hand grenade and can be thrown like a football. The PSK is a "throw-and-forget" drone, Balan says, referencing the "fire-and-forget" missile that, once locked on to a target, can seek it on its own. Instead of depending on remote controls, the PSK will be operated by AI. Soldiers should be able to grab it, switch it on, and throw it"just like a football. The PSK can carry one or two 40 mm grenades commonly used in grenade launchers today. The grenades could be high-explosive dual purpose, designed to penetrate armor while also creating an explosive fragmentation effect against personnel. These grenades can also "airburst""programmed to explode in the air above a target for maximum effect. Infantry, special operations, and counterterrorism units can easily store PSK drones in a field backpack and tote them around, taking one out to throw at any given time. They can also be packed by the dozen in cargo airplanes, which can fly over an area and drop swarms of them. Balan says that one Defense Department official told him "This is the most American munition I have ever seen." The nonlethal version of the PSK [replaces] its warhead with a supply container so that it's able to "deliver food, medical kits, or ammunition to frontline troops" (though given the 1.7-pound payload capacity, such packages would obviously be small).