This undated photo released by Northrop Grumman Corporation in 2018 shows the first two operational MQ-4C Triton unmanned surveillance and patrol aircrafts that Northrop Grumman delivered to the U.S. Navy in Naval Base Ventura County Point Mugu, Calif. Builder Northrop Grumman says the single-engine jet can stay aloft for more than 24 hours. (Bob Brown/Northrop Grumman Corporation via AP)