What it does
A plain-language summary is coming. Here is the official summary from the Congressional Research Service:
Mark Our Place Act This act authorizes the Department of Veterans Affairs to furnish a headstone, marker, or medallion signifying the status of a deceased member of the Armed Forces as a Medal of Honor recipient regardless of when the member served. Under current law, only Medal of Honor recipients who served after 1917 are eligible for such markers.
How Congress voted
This law passed by voice vote or unanimous consent, so there is no record of how individual members voted.