WASHINGTON (AP) — Six U.S. companies will spend at least $350 million to manufacture medical gowns to store in the Strategic National Stockpile, years after doctors and nurses working in hospitals found themselves without the equipment while COVID-19 raged. The purchase of the gowns is one of the final steps toward shoring up the personal protective equipment in the stockpile after it was depleted just weeks into the COVID pandemic. Equipment had not been regularly restocked in the years before the crisis began.