The 6888th Central Postal Directory Battalion was the only one comprised of Black women to be sent overseas during World War II.

On Tuesday, the 6888th Central Postal Directory Battalion — the only mostly Black, all-women unit to serve overseas during World War II — was awarded the Congressional Gold Medal, Congress’ highest civilian honor, at the U.S. Capitol, according to ABC News.

Members of an elite female WWII unit that notably improved the morale for soldiers on the European battlefront were honored by Speaker Mike Johnson on Tuesday. During a Congressional Medal Ceremony on April 30,