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.

The Six Triple Eight sorted millions of pieces of wartime mail in a matter of months but weren't recognized publicly for decades. Just two of the 855 women are believed to be alive for the ceremony.