>> if we lost all our gps satellites, it would be a bad day, for sure. >> most people know of gps technology for its mapping capability. and today, the u.s. military depends on that tool. every aircraft, ship, submarine, guided munition, drone, and war-fighter on the ground. >> over half of the munitions we're dropping against isis today in centcom are gps-enabled munitions. what that means is we're able to strike things more efficiently, more accurately with less civilian casualties or other casualties in the area. >> but gps satellites also provide precision timing to the civilian world. space command estimates that some 3 billion people take an action dependent on gps every day. >> if you got gas today, that atm system in the gas pump is timed off of gps. the gps goes away, that doesn't work.