• The U.S. Navy is under urgent orders to improve its safety procedures after two collisions in two months left 17 sailors dead in the Western Pacific. Above, the U.S.S. John McCain.

The changes: More sleep and no more 100-hour workweeks for sailors. Broadcast a vessel’s position in crowded waters. Use old-fashioned compasses and pencils to help track potential hazards. And more new guidance is expected in coming days.

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