An Air Force Thunderbirds pilot died Wednesday after a crash outside Las Vegas. According to Nellis Air Force Base, his F-16 Fighting Falcon crashed over the Nevada Test and Training Range about 10:30 a.m. The jet crashed during a routine training mission. An investigation is being conducted into the cause of the mishap. This is the second crash in less than a year for Nellis. Another Air Force pilot was killed in September after a crash during a training mission. Wednesday’s crash was the third U.S. military aircraft crash this week.