The U.S. Navy carried out four scheduled missile tests of a nuclear-capable weapons system off the coast of Florida last week, according to the service.

The service’s Strategic Systems Programs conducted flights of unarmed Trident II D5 Life Extension missiles from an Ohio-class ballistic missile submarine from Sept. 17 to Sept. 21 as part of an ongoing, scheduled event meant to test the reliability of the system.

“The missile tests were not conducted in response to any ongoing world events,” a Navy release said.

One of the launch events Sunday was visible from Puerto Rico, illuminating the night sky in photos shared by the service.

The planned event marked the 197th successful flight test of the Trident II D5 strategic weapons system.

The missiles were fired from a submerged submar

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