US sailors on a frontline destroyer in the Red Sea sometimes have just seconds to open fire on enemy missiles

• US Navy ships have spent months shooting down Houthi missiles and drones off the coast of Yemen.
• Sailors on the warships sometimes have only minutes, sometimes just seconds, to deal with a threat.
• Business Insider recently visited the USS Gravely, a destroyer on the front lines of this effort.

An anti-ship missile is inbound and coming in fast — as the red line that has suddenly appeared on a digital map inside the destroyer's combat-information center shows — and the ship's crew has only moments to respond.

This simulated scenario that Business Insider observed firsthand offers a glimpse into what sailors aboard the American warship USS Gravely have been facing.