Israel said it launched a new spy satellite into space as its leaders hinted it was behind a fire at an Iranian nuclear site.
A Falcon 9 rocket blasted off from Florida's Cape Canaveral Air Force Station, carrying the GPS satellite to orbit.
The $1 billion satellite is the sixth and final one in the U.S. military's Advanced Extremely High Frequency series.
"Liftoff!" came the call at T-0 minutes, and then ... nothing.
Sunday's failure came after two failed launches of the Payam and Doosti satellites last year.
The SDA is on track to become part of the Space Force the same year it plans to launch a series of tracking satellites.
Early warning capabilities helped protect U.S. troops on the ground.
SpaceX launched 60 more mini internet satellites late Monday, this time testing a dark coating to appease stargazers.
The satellite — called Icon, short for Ionospheric Connection Explorer — rocketed into orbit following a two-year delay.
It was the third flight of a Falcon Heavy rocket, but the first ordered by the military.